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Google: Haven't provided your phone number? It'd be a shame if something happened to your email...
(lemmy.ml)
Gmail prompt to provide phone number sounds like a threat
Say more?
NixOS supports headless LUKS, which was an improvement for me in my last distro-hop. The NixOS wiki even has an example of running a TOR Onion service from initrd to accept a LUKS unlock credential.
It's worth watching.