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Google gives Android users a way to install unverified apps if they worked hard for it(including waiting 24 hours)
(android-developers.googleblog.com)
This is a most excellent place for technology news and articles.
I hate the fact that Android is open source only on paper. You can't compile your own flavor and install it.
You absolutely can... Custom ROMs do just that.
Your phone has to support it. It's not a Google wall. Your phone maker determines how difficult or easy this is. Google pixels make it rather easy to install Graphene on. Motorola is also going to support Graphene.
There's also lineage and e/os/ and even non-AOSP-based postmarketOS(which is a Linux distro.)
Which is not as libre as a computer OS. What I mean is that Google has complete control and power over it as it's not developed by the community and therefore doesn't do its best interests