I guess they meant “pennies per game sale”, in which case 30% could be quite a generous cut. But, of course, buyers can download the game many times, and forever, so it’s really hard to measure what’s a fair cut.

To me, it’s not a monopoly because Steam doesn’t require exclusivity, and there are other stores (including physical a stores).

I’m genuinely wondering if there is any specific game where you noticed that the Linux version was worse than the Windows version on Proton, and how you verified that the Windows version wasn’t just as bad.

I think it is clear that it’s just a matter of time that a faster, more secure, free and open source operating system will win over a worse alternative.