I use BTC to purchase prescription drugs that I have a script for but refuse to pay absurd marked-up US prices for. Is that illegal? I suppose it is by the lett

I use BTC to purchase prescription drugs that I have a script for but refuse to pay absurd marked-up US prices for. Is that illegal? I suppose it is by the letter of the law. But certainly not by the spirit of it. I am also a notable figure in some circles and do not want my name or credit card information to appear in the ledgers of certain vendors, despite them being legitimate businesses, due to potential records being exposed from hacking. I therefore use BTC and I've used mixing services on top of that. There's plenty of other reasons, but those are my first-world ones. And I'm not even a privacy nut.