Yeah. They overhauled save the world several times during the alpha trying to figure out what they wanted it to be kek. So I remember STW facing major changes and conversions until they settled with what they have now.
I was a sort rollercoaster ride that If I recall had progression wipes in the way as well. I remember most my /tableflip moments on outpost defenses, it was crazy hard.
I didn't care for the BR mode, otherwise I'd have the battle bus banner as well kek
edit: I do recall something about PvP inside STW at one point?
There was a PvP very early on, but I missed that. And each (or pretty much each) new OT came with a full progress wipe.