Signal Will Let You Sign Up Without a Phone Number — For $3

You mean they want to identify you from your credit card instead of your phone number? Bah.

They claim it’s “zero knowledge” proof through Google pay, meaning that Google will know you paid Signal, and Signal knows you paid them, but there is no link between the two that uses your PII payment info to identify the Signal account. I’m inclined to believe them.

Unless you wait a good while to use what you paid for (if that’s even possible), then I doubt it’d be hard to connect the dots. Never mind connecting transaction records.