In 2. Relying on incentives.

A system that can rug everyone is kinda bad isn't it? Eg: I don't put lots of funds in Wallet of Satoshi. If WOS rugges everyone, I lose a little money. But WOS rugging everyone is attractive isn't it. There's a lots of bitcoin locked in them.

Also, I'm wondering is it hard for entity like WOS to implement ecash into their system as a default. I'm already trusting them with a little money, if they turn everything into ecash, it least I can get privacy.