devtrackers.gg
One of the very first questions is what zone you are in. Hopefully they will take more consideration to those in canny and twine.
The sample is sent to a range of people of all experience levels in order to get a good representative sample. We then break the data out by experience levels when looking into the results.
People who are more experienced tend to fill in surveys more often, so we include that little bit of text about "only played once" to try to encourage the less experienced folks to also open up the survey.
The link for the survey is possibly linked to game activity data for that person, meaning they actually can see the link between certain feedback. (That's at least how I'd organise the data, load in player stats, make them anonymous and link them to a unique url, then send out the url for the survey). The mail however is standardised so they have to include that part for those play once and quit people. Until you get feedback you don't really know why they quit and if there is anything within reason that can be improved there.
You are 100% right.