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AOSP isn't dead, but Google just landed a huge blow to custom ROM developers
(www.androidauthority.com)
This is a most excellent place for technology news and articles.
This is not a selling point but rather a unfortunate but comprehensible circumstance. Nexus and later Pixel phones have not been anything more than reference hardware without significant sales until the Pixel 6. Google has been a software company that has greatly benefited by android being an "open" platform you could contribute to and use their services on.
The App / Cloud ecosystem has gained a lot of competitors, so Google is doing their best to reverse this course of action by pulling more and more functionality out of AOSP into Play services and now into Cuttlefish. We can only wait and see how other phone manufacturers react to this.
Honestly, it's obvious how they will react. After all, they'd have to pass a certification process if they want to be able to ship Google stuff.