They will track you with artificial intelligence and it will be done with the same biases that google has already established.
But again security through obscurity. There’s lots and lots of people doing lots and lots of transactions. Part of the advertising of those things. Sell stuff anywhere any time. Have a yard sale, go to yard sales, sell your foam finger at the stadium. Most of these transactions are person to person. And really, nobody wants to put that much work into busting street dealers, they only get busted when they’re too obvious and the cops feel insulted, or when the cops are working the chain to try to hit the big guy.