I like what Graphene is doing for security but instead of giving $$$ to Google in order to have #degoogled, I'd rather invest in improving #LinuxMobile which is a pro-freedom solution from the get-go and is not held hostage by a hostile codebase.
Perhaps this analogy will be correct: It's like moving into a less than ideal house that you can own forever versus moving into something that looks more like your dreamhouse that you don't really own.