Buying and selling 'assets' on the Darkweb and amongst people you know in other countries with restricted foreign money transfer is one main use case of CoinBase.
In fact, I doubt BTC would have thrived as much as it did if it wasn't for SilkRoad/DarkMarket/EmpireMarket/WhiteHouseMarket etc. Not to mention the hundreds of millions that went into worse endeavors like ransomeware and funding terror organizations.
BTC didn't become what it is without the billions of dollars in demand for those very real use cases. Each drug dealer exchanges tens and hundreds of thousands of USD in crypt, much more than the average regular crypto enthusiast. BTC investors are investing in blood money, like it or not. It's not just a magic computer token thingy, and it hasn't been for a decade now since the SilkRoad inception.