Democracies have to start making laws that stop assholes like Musk from interfering in their domestic politics - including and up to imposing heavy fines, service shutdown and personal criminal liability. If a person is not a national and domiciled in that country they should have no right to influence that election through campaign contributions or any other assistance.
SteamOS is about Valve not paying Microsoft a license fee. It’s not some egalitarian move by them but a cost saving. From a game dev’s perspective it’s additional cost and effort to port a game, or hope it runs under emulation with Proton.
I am surprised they haven’t used it for cloud gaming yet since that’s where the real cost savings kick in but I bet they’re still saving on each Steam Deck they sell without Windows on it.