> As much as it seems beloved here, people that flash custom Android OSs are the very definition of niche users.

Hmm... Let's try reframing this: "as much as it seems beloved here, people that install their own operating systems on PCs are the very definition of niche users"

I'm absolutely certain that's how IBM felt before the clones. But the ability to install what they wanted on a defacto standard platform is what launched the computing revolution. I think we'd still be living in a sterile monopolistic environment with $10k compilers otherwise.

Folks installing their own ROMs on phones are only niche because they've been pushed out at every opportunity using locked bootloaders, embedded security processors, factory installed secret keys, etc.

Despite all that, there's still thriving communities developing and using custom ROMs on their phones. That demonstrates more than niche demand.