They are not going to forbid installing niche OSes because it'd look bad and they can do better. Today you can't use banking app in a rooted Android, you can't

They are not going to forbid installing niche OSes because it'd look bad and they can do better. Today you can't use banking app in a rooted Android, you can't watch high resolution licensed content in your linux PC, you're at the whims of rootkits disguised as anti-cheat frameworks if you wanna do online gaming. Tomorrow you'll be required to use signed browser binaries by selected vendors running on a signed OS unlocked by TPM loaded with your ID card for joining a video call for a job interview or something. Did you say your niche OS? Sure, you can view their support forums or wherever other hobos are hanging out for leisure without any of that.