Honestly, at this point if you’re still on Windows for your personal hardware, that’s on you. Linux gaming with proton is great. Most apps have web versions even.
No they won't, they already tried before with companies like Loki.
Android games done with NDK are made with the same APIs available on GNU/Linux, studios don't make them available on GNU/Linux as it isn't worth the additional development costs in QA and support.
Luckily for us most modern engines allow for devs to support all three platforms. With more Linux users, game devs will have more incentive to put in the extra work.