No, not really. It makes it useful for criminals, and a small number of people who might have good reasons to buy things, but that doesn't mean it should have a market cap of billions.

I'm not saying there are no good uses for bitcoin, of course. For example, if someone used bitcoin to import prescription drugs from Canada to the U.S, that's great. But it doesn't justify a $100B+ market cap, and as it stands, the hard part of doing that is importing the drugs, not exporting the money.

Similarly, just because Tor is useful mostly to criminals and a few human-rights advocates or privacy enthusiasts, I don't expect the Tor Browser to ever gain a major market share.