

Wine/Proton isn’t designed to be a sandbox. A motivated enough attacker could make an exploit that checks if it’s running in wine and do some wine specific stuff.
Even if you do manage to sandbox it from your root filesystem, it still needs access to your Steam account, which an attacker could compromise.
Isn’t “people acting like little shits and ruining everything” part of the core experience of Place? Like, the original one on Reddit had a lot of conflict, all in (mostly) good fun.