The reason for Bitcoin's with the relationship with the Austrian School is that other schools promote central planning in money foundation, creation and apart from minor exceptions (e.g. international trade), assume that people do not have a choice. So Bitcoin refutes them.
The reason why Bitcoin is suitable for some semi-legal and illegal stuff is that the states intervenes in markets, and Bitcoin is more resistant to this intervention. If it wasn't, it would not work at all, its inability to resit would mean that ultimately it would be regulated to death and that would be the end of it.
The result of Bitcoin's position is simple economics. Its theoretical foundation doesn't fit into statists' minds. Its features mean that its comparative advantages manifest primarily to those that are sensitive to transaction costs and/or those who gain a significant reduction thereof. It is very sad that a professional economist does not understand this.