As long as SteamOS doesn’t fail, yes. If SteamOS draws enough gamers for there to be a healthy amount on Windows and SteamOS there will be competition between the two OS-s, which will benefit everyone. If SteamOS does draw away the supermajority of gamers then we still benefit because the open source nature of Linux makes it much harder for Valve to have total control like Microsoft has.
Piefed might work a bit different but on Lemmy there is one key aspect where instance matters, and that’s community discoverability. Discoverability works only on local communities and for communities that my instance is already aware. The way to make the instance aware of a community is by knowing about it beforehand and doing a direct search. So for example if we take a completely unknown community like [email protected] and I just searched “mediashare” on lemm.ee I wouldn’t find it. For anyone testing on lemm.ee that’s now discoverable because I also searched “[email protected]” which is a direct link and made it discoverable for everyone else. In that sense lemmy.world probably has the best overview of all communities because more people equals more people checking out different communities which makes the instance aware of more communities which makes the search for communities more functional.
IMO this is a downside of Lemmy and should be fixed. All instances should have a list of all the communities other federated instances have. It would significantly improve the search functionality.