Desktop Linux and Linux gaming largely exists on the back of hobbyists. DXVK was created by a hobbyist who wanted to play Nier Automata and just got officially hired by Valve later. Many of the projects that now make up Proton and SteamOS started the same way. Valve is effectively the only major corporation backing it, and they're going out of their way to elevate community-driven projects.

Absolutely, but the core development started as a personal project by Linus in 1991. The existence and ongoing maintaince of the product is owed to a collective effort of both individuals and corporate contributions, not a specific corporation looking to push a product. My point largely is that if Microsoft can't make a better problem than something that doesn't earn a guaranteed revenue stream, they largely have themselves to blame.

linux doesnt exist because hobbyists make it. the inteternet runs on it. the largest companies in the world run on it

The latter statements don't make the first one any less true.