I posted the original comment everyone is replying to so it's clear I'm not fan of crypto. To be fair, literally everyone I've ever known, including myself, has only ever used cash to buy drugs. I can't put that on crypto.
For online sales of drugs it’s through crypto. Also, it’s the preferred way of paying ransom these days.
There's a pretty big market for drugs and other illegal things on onion websites. You send an encrypted order, transfer crypto to an escrow wallet, then they send the product in the mail.
The only person I knew who had BTC in like 2008 used it to buy drugs from the Silk Road. They're dead now so it doesn't matter.
On a whim in say 2011 I bought 2 bitcoin. 3 weeks later they had tripled in price (not like what happened much later) and I immediately sold them as I was uncomfortable using a USB drive s a wallet for currency. It was dumb to sell at that stage but I have always been somewhat risk averse with my finances. (making money has always felt like _work_ to me ;)