That doesn't explain why it has nothing to do with spam.
If you know how to build an anonymous communication platform, that is convenient to use, and is also spam resistant/proof, you have the miracle platform idea.
And then when you're faced with potential criminal suits and/or the security state coming after you for "national security" reasons, you implement the tracking the government wants so you don't potentially go to trial and/or prison.
That's why Signal only stores your phone number (and when you last connected) - they know nothing about your real identity, so they can't link it back to you.
