A few issues that I think will prevent that:

1. Running a mint that serves DNM users is a great way to end up in jail, so you can't base it on public rep

2. Trust issues are core to DNM operation, so trusting a custodian blindly is very much a no-go in most situations

3. It's always easier to just use Monero which removes custodian risk

Tech is much more interesting for community custody or similar where the custodians can be known and trusted by the users and have a vested interest in not rug pulling.