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Android's new developer verification rollout begins, sideloading changes are next
(www.androidauthority.com)
This is a most excellent place for technology news and articles.
Alternatives
Fairphone https://shop.fairphone.com/the-fairphone-gen-6-e-operating-system
GrapheneOS https://grapheneos.org/
Sailfish OS https://sailfishos.org/
LibrePhone from GNU/Linux https://librephone.fsf.org/
To be fair, LibrePhone isn't an alternative because its just an announcement of a project. There is nothing viable yet from them.
It also is not an actual OS but just reverse engineered blobs so someone else could make an OS, they might not even be able to port a mainline kernel to any devices