Remember how hard Amazon had it to attempt an Android fork?
I was due to OEM SOC access being locked out due to those contracts....
Any open source mobile OS attempting to complete with AOSP needs access to mobile OEM soc providers not touched by AOSP contracts and currently that is somewhat hard.
Do you ever feel like the same food item doesn't taste the same it did 10 years ago? Maybe it's your memory being faulty or maybe the company got new management which decided to cut costs while keeping prices, extract the differential value from customer inertia and move on when the product stops being profitable.
Android is the same. Certain freedoms were a part of the offering - a part of the brand name. They no longer are. Not only should lose their trademark[0], they should be legally forced to change the name.
[0]: The purpose of which is to identify genuine product from counterfeits - in this case, the counterfeit just happens to be by the same company which released the original product.
Let's focus on making it possible to use really open Linux systems on smartphones.
Regarding some concrete examples - Google can deeply integrate Gemini, but a competitor can't do this and users get no final say here either. Competitors are restricted by the permission system, Google is not restricted at all.
While rooting can alleviate this to some extent, Play Integrity is there to make sure the user regrets that decision to break free..