No, the point is… It might be obvious you’re using that specific browser, since it’d be very niche, and combined with something like your IP and maybe something like browsing patterns that might be enough to identify you.
It doesn’t matter how much fingerprinting information you hide if you replace it with new information that’s just as useful.
I don’t have a tutorial, but once you do have a Linux install, for standalone games I can recommend checking out Lutris. It has many user-provided install scripts that can set up games automatically, seems to include Guild Wars 2: https://lutris.net/games/guild-wars-2/
Interestingly, Guild Wars 2 is apparently also on steam - for steam games I recommend looking them up on protondb, in many cases windows-only games work out of the box, but if you’re not afraid to do a bit of tweaking, you can often find fixes there: https://www.protondb.com/app/1284210
I don’t think anything you said makes it not free, as long as you can fork it. The same can be said about most FOSS, since somebody, usually the creator, is in control of the repository.
That’s the point of FOSS - your repository isn’t becoming a democracy by virtue of using a permissive license, but it means somebody could outcompete you with a fork and effectively take over as the dominant project.
Isn’t installing extensions in it also a pain, since the Google webstore doesn’t let you install from it?
I guess to answer my own question, I looked it up - there’s an extension to let you do that alongside some flag changes, so I guess not too bad… But it’s another step on the list of things you’d want to do as a user