Yes, I agree the phone number requirement is not ideal, and there are better alternatives like SimpleX that are technically superior. But say your friends and family all use Signal: As a hypothetical, what would be the best way to go about using Signal for them?

"There are no burner numbers."

I just provided a few links above to grab a temp phone number to use to verify Signal, almost no account info required, using a fake email, and you can pay with coinjoined Bitcoin or Monero. Anyone in the world can use it. If done correctly behind tor, or at least a good VPN, it seems like it would be pretty anonymous. And once you set a Signal pin for that phone number no one should be able to use that phone number again to register on Signal. In theory at least.

So, the way I understand it, Signal is very private cryptographically, just not anonymous because of the phone number requirement. But they seem to help obfuscate who is messaging who using another cryptographic technique they call "sealed sender" to break up the connection graph. But this is just my understanding I don't know if it is correct and am not an expert on this stuff. That's why I asked if you or anyone else could give me some insight.