If you make it illegal to accept BC as a business that will deter many websites from using it. And the best way to kill BC is to make sure it doesn't hit critical mass.

The difference between filesharing and BC is that in the former the value is in the files, but BC is only valuable if you can trade them for something you value.

> How are they going to "crack down on bitcoin"?

Govt can crack down at any point where bitcoin is convertible into something that they can affect.

For example, they can stop many biz from accepting bitcoin.

Sure, you'll probably be able to buy foreign porn with bitcoin, but ....

> Note how well the crack down on filesharing is going...

That's a very different problem.