[krisoft]

> I think twitter can do it because its big enough.

This depends on what you mean by "it". If you mean "refuse to pay bill" then everyone can do that, no matter for how small or big. If you mean "refuse to pay the bill and get away with it" we are yet to see if that is the case with twitter even. Sure, their account was not terminated immediately. But that doesn't mean there are no adverse consequences which can catch up with them eventually.