the conversion (between crypto and fiat) is the problem. you can't convert more than a couple hundred euros without KYC.
>How exactly do you measure what is what on crypto with mixers and anonymous currencies?
you add up all the transactions on the blockchain and subtract all the transactions connected to wallets of centralized exchanges.
>you mean via Bitcoin? You know there are other coins.
"god of the gaps."
tl;dr: you originally claimed there is nothing we can know (and that therefore we should assume without evidence that money laundering via crypto is a huge problem). but there are a few things we can know.