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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.
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