It's not the exchange system that matters, it's who holds the account.

With bitcoin if I hold my coins in a currency exchange (which is basically a bank) they can obey the court order and reverse transactions.

And I can become my own bank, and then hide, in which case it would be hard to serve a court order on me. (Although banks often have accounts at the fed, so they don't hold the money themself.)

What's unique about bitcoin is most people hold their own accounts. So you have to find the account holder, which is hard. But, as I said, it's not the exchange the matters, it's the account holder.