I don’t understand, you know what I will ask next.

And broadcasting on FM radio is then what?

You’re just redefining words, there’s no need for this. We agree it would be better from a privacy point of view if Signal did not require a phone number but you’re nit picking: it’s a one time thing, and you can take a public phone that no one can associate with you for this. And then never need it again if you have proper backups.