Natanael

Rubber duck debugging

You could tie it to requiring access to a digital ID (with password / PIN protection, etc), but yes kids could still "borrow" it

What you want is cryptographic Zero-knowledge proofs, not regular encryption. See anonymous credentials protocols.

And it does require every verifying entity to trust the issuer (each user could collect attestations from multiple issuers, to prove different things to different verifiers)

Another issue is the risk of deanonymization by verifiers simply asking for more proof of many different properties, until you can be identified anyway

Or they're trying to figure out who's trying to stay connected with who

Consider getting VoIP phone numbers from a jurisdiction that's much less hostile, so you have another number available to use

... And feed the credit card issuers?

A reminder that "cashback" credit cards are paid for by big fees on transactions which the store pays, forcing them to raise prices. It's literally anticompetitive

The other Red Hat

At least 3

"freeing up space on the user's device"

Kinda like rocket league boosts, haha

Geometry