For sure, valid to fear the enshittification of steam. But they aren’t killing proton. Maybe ignoring proton at worst. But Steam has profit motivations for not being reliant on Windows, which has actively been trying to supplant them with the Windows Store for years.
As another separate, profit-motivated company, with a gaming division and a lot to gain from eating Steam’s lunch, Microsoft is not Steam’s friend. Proton is a critical bargaining tool for them, and not having to include windows licenses for devices like the Steam Deck helps their costs too.
Eh, this is a thing, large companies often have internal rules and maximums about how much they can pay any given job title. For example, on our team, everyone we hire is given the role “senior full stack developer”, not because they’re particularly senior, in some cases we’re literally hiring out of college, but because it allows us to pay them better with internal company politics.