Cash withdrawal / Prepaid cards can be traced back to me

IDK... I get cash from my bank. I watch teller grab bills, hand them to me. She doesn't scan serials. I suppose it might happen for very large transactions. Or if they have a criminial investigation going and are using bait bills. But I've never seen it when I get cash.

Plus, say serials WERE logged. Take bills, buy lunch at local food truck for cash, get change from the nice Mexican lady who makes the badass green chili sauce. Thank lady, enjoy burrito. Bada bing, untracked serials! Burrito truck is not scanning shit.

Seems like in theory it can trace your purcahses, sort of, if both sides of the transaction record the serials. But in practice, it's astronomically unlikely. It feels like robust and easy anonymity for buying things. Even more than most cryptocurrency, with how easy opsec failures are, and every transaction being on a permanent blockchain.