Not anymore. After public outcry, Google established 2 alternatives:

1. Through developer mode, you will be able to “forego security” (according to Google) and do a lengthy and obnoxious procedure to unlock your phone for installing any app.
2. They’re defining a way for official (sanctioned by Google) 3rd party app stores to work, and you will be able to install apps verified by them, instead of Google.

Stallman was right: https://www.gnu.org/philosophy/right-to-read.en.html

This is from 1997, mainly about books but it mentions debuggers and “free kernels” (linux and… hurd?). Considering that they also want to force OSs to require their users’ age and some Linux distros won’t do it… illegal Linux distros may be in our future.