I would separate rug pull risk from service failure risk. Cashu is custodial without unilateral exit so with or without enclave, if mint goes down, funds are inaccessible. To me it looks like rug pull risks are minimized with enclaves - we could get a lot of independent mints all running verified code, which sounds quite awesome. The rest are reliability questions: backup might be sync real time, coordinator can live in another enclave, dns record can be controlled by the current master, updates don't require a blockchain - just a set of signatures by pre-declared maintainers (that's my current approach). Not that it's a proven set of solutions, or that I am against the blockchain, but I think more experiments are needed to figure out the actual problems and solutions.