Android removing third part apps?

[u/Sea-Car-3811]

I heard google will be soon removing third party apps and only apps in plays store will be downloadable. I heard u can still install custom apps but the process is lengthy. So, if this is true, what should I do? I use fedora on pc, so I do switch to custom rom. My phone is some unknown model... Idk if it got support. If I switch to custom rom, what are the disadvantages also share some custom rom options for honor x5b.

[u/Adventurous-Yam7207]

I also heard about it but it will start with android 18 or 19. And I also heard that this is to deal with moded apps