As much as I agree the 30% cut can be a bit steep, I do appreciate that part of it is going into ongoing R&D like Steam Deck and Proton benefiting the whole gaming industry. I’d like to think of it like Valve are investing into PC innovation similarly to the way Playstation, Xbox and Nintendo do for their new consoles.
For devs who routinely boast about their (ineffective) anti-cheat, this is truly some amateur hour code. No wonder cheaters run rampant in their games.