The signal will be when cashu and other bitcon-backed Chaumian eCash implementations hit the darkweb, it will be the end of privacy shitcoins.
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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.
1- Mint after tor, no more dangerous than running "candy" stores after tor.
2- federated mints so as not to rely on a single entity.
