I'll just comment on those with quotes:
them removed the update tree from the website(which was the main way to see what they were working on)
The tree on the website broke a good while ago after it became outdated from a technical standpoint over the years of backend updates, it was no longer possible to view the details and as such it was removed until we have the resources to fix it up when we released the website update for the new cloud backend. I'm pretty sure I said that elsewhere. We only have a single part-time backend and web developer that currently needs to take care of the cloud integration and still has multiple items to bring back, given we said in the release notes of Update 11 that the new backend is rolled out in stages (Tiers, Tokens, Icons, etc.), so that will still take a while.
The last News on the website is from Jan 2023(v10 reveal) but they did add a way to purchase the new eco credits.
News haven't existed on play.eco for a good while since our main communication channels became Discord and Steam many years ago (and since the news were actually simply moved ingame, people barely use websites anymore for such information), so I assume you refer to the company website. That one is actually separate from the the play.eco backend (that also has the marketplace), not actively maintained and only updated sporadically as needed as it is targeted to business partners not players, but I agree it should at least have major update news, so I'll get that fixed.
added a predatory and money-hungry new marketplace that "supports" server owners and modders (by giving them in-game coins)
Everything about the marketplace has already been said on all channels, just not by everyone. It's implemented as a way to support the development, also giving back and recognizing those people in the community that have a big part in making Eco great.
they have an unannounced game on their website for a while now but have yet to talk about it
The unannounced game actually exists since longer than 2018 and is mostly a design prototype at this point, it hasn't been worked on actively for years. I unfortunately can't tell you anything more about it.
beyond bad reception of the latest update (no player increase and 49% positive with a chunk of positive reviews complaining about the shop)
the complete silence on the reception of the new update from the devs)
There actually was no silence on the reception of the last update, I have personally been communicating with everyone that wanted to on all channels about the marketplace. There I also said that we obviously were aware that adding a marketplace will not be the most popular decision we can do, but that we nontheless stand behind it due an additional way for funding having been necessary. I can't change that fact, but we didn't hide from the feedback.
the 1.0 update supposedly coming out Q4 2024/Q1 2025(as said on the wiki)
That has been announced early this year and is still the general plan.
Those facts combined make me think that they might be planning to abandon the game and run with the money,
If there was so much money "to run with", we wouldn't have needed to add a way to support the development for existing players.
what the tree signified(and this is a direct quote from the 9.0 update)"Eco is our forever game, something we plan to continue growing and expanding indefinitely. As such, the vision of where we’re going is something we really want to share with the community, inviting them to participate in its creation. So with 9.0, we’re also launching the Eco Tree, which is our new interactive hub for presenting the game and connecting the community and devs", its removal could mean that the "forever game" stopped being that and is nearing its end
The early access note still states the exact same, nothing changed.
the new marketplace ruining the economy which is the core mechanic of the game (servers are incentivized to keep it on to earn money and even if you can't sell the items there doesn't seem to be anything that would stop you from simply placing it on the buyer's plots directly and selling them like that) means it's possible they no longer care about the game
Yes, they could do that - but the buyer could then never move it. It's easily preventable by admins or laws as well. Though the actual interesting point is that we of course as promised monitored the situation and the feedback we received post-release was generally (though of course not in every singular case) exactly what we expected - the servers that allow trading have not noted any negative impacts within their concepts and communities and there has been no notable problems on normal servers either. Ultimately many more servers allow trading than disable the marketplace, which was an actual unexpected surprise. Of course it will take longer than a few weeks to gauge the actual situation, when everything is no longer as fresh and one can see things in actual daily application instead of assumptions, but we don't expect that to change from what is already visible - the marketplace is not ruining the economy.
the obvious lack of comments on the current state makes me think that they genuinely don't care what the players think anymore
Well, I don't know where you are looking out for us, but we're basically responding and commenting everywhere, on every single channel, all the time. You can even just chat with us on Discord. There simply is no lack of comments.
The 1.0 update supposedly coming in the next half a year when so far they added only one of the roadmap items(and possibly the simplest) seems unlikely
I already addressed that on Steam in detail as well, but:
Update 11 already introduced outdoor rooms, cultural expansion and maintenance. Off-grid placement is also already contained as a hidden, disabled feature coming soon. That's not just one item.
The next update brings maintenance to vehicles and more objects and adds repair bounties. The tutorial has been reworked as well for improved new player experience. It also expands painting to land vehicles, Jens will have a developer stream about it on Friday.
Generally the only two items no longer planned is oil spills and beyond meteor challenges that will be moved to after the release. Some items are adjusted, additional professions and infinite star spend is planned to be merged into a talent rework and the already added ability to limit professions and more easily configure your server settings, now also ingame.
We'd like to add the electricity selling feature that is currently the second most voted on feature and a research overhaul to tackle group, rush and dropoff issues instead of those. The next new feature addition in any case will be explosives.
In the end the marketplace was introduced exactly for the purpose it was stated - offering a way to support development for existing players, to allow us maintaining and hopefully expanding the resources we can afford without needing to make major changes in direction to appeal to different audiences, for example by adding PvP. The general plans for Eco have not changed at all.