The infuriating part of the Google enshittification process is that there is absolutely nothing the user can do about it.
Literally the only thing that motivates Google is profit. Controlling side-loaded apps will almost certainly boost their profits by a infinitesimal fraction of a percent, therefore it will be done. Even if consumer uproar causes Google to back down in the short term, they'll simply implement this a few months later. Late-stage Capitalism sucks.