Hmmm, so much to think about here in the game theory of how mints and users might interact through lightning with this. I guess nothing stops the mint from stealing your deposits, but then that mint would be out of business, and B mint would only work with C mint if C had passable audits. D couldn't siphon funds (in cahoots with C mint) because that bitcoin would still be locked in channel, so its not any more useful than C mint stealing straight up, as soon as a rebalance happens its over.