In my opinion what Meerkat did wrong was not making relationship with Twitter. The reason why they got blocked are simple:

- v1 of Meerkat was posting on user's behalf without permission, auto-follow @Meerkat on sign-up, sending Twitter notifications without permission.

- user's social graph cannot be ported to the 3rd party apps

- recreating commenting network using Twitter's API

This is why I am not surprised Twitter blocked them. They say: "you don't shit, where you eat".