Whats going on re Lemmy & Firefox?

1 gotcha for gaming on steam is anticheat enabled games. If you play competitive games where third party anti cheat is required often you will not be able to play them even if they say they support Linux on steam.

Its the only OS option that could farm engagement, as no one would react to him using windows or mac

Linux is the backbone of large portions of the internet so tonnes of money is poured into it. Althought Linux has a niche userbase for home PCs it is often the default choice for servers & development.