I think perhaps you’re misunderstanding my concern. We are discussing the regulatory compliance aspect to running a custodial wallet (particularly in the US/EU).
Users trusting their funds (in whatever size) to a custodian is a separate discussion and an individual decision.
I understand that and in fact it is very important to other stakeholders for instance people concerned about the legal framework, jurisdiction, etc. Regarding code and the use of Apple Secure Enclave I think it does support EEC algorithms like NIST P-256, P-384, P-521 but not our unique Bitcoin secp256k1. About app code it would probably need OpenSSL or libsodium to integrate into iOS..
