Projects like Zcash and others are designed with privacy in mind, but aren’t yet fast enough or mobile-oriented enough. Transactions can take tens of minutes, and even with shortcuts to speed up an individual transaction, subsequent transactions can block on it. They also require all clients to scan all transactions made by all other clients in order to identify those relevant to them, which won’t work on all mobile devices on all networks (similar to how requiring all Signal clients to scan all Signal messages everyone sends to everyone else in order to identify those destined to them wouldn’t work).
Signal >> Blog >> Update on beta testing payments in Signal
Perhaps someone from ECC should reach out to them and show them Zcash mobile wallets?