Governments don't outlaw all speculation (which is what cryptocurrencies currently are), or for that matter actual investments for the most part. They regulat

Governments don't outlaw all speculation (which is what cryptocurrencies currently are), or for that matter actual investments for the most part. They regulate them to ensure that mostly people aren't being robbed blind, and they want their cut (i.e. taxes). So long as you aren't hoping to use them as a tax fraud scheme I don't see why you would expect the government to want to shut it down. If you do hope to use it as a tax fraud or the like, you're likely in for an unpleasant time once the slow-but-steady process starts to focus on that.