For your lay: the government puts a significant fraction of the coins into these boxes and can use the statistical information gained from this to deobfuscate transactions. If you put enough money in, either at once or slowly over time, they can figure out who you are.

Monero is untraceable (if you don't use a KYC exchange to get it), but Monero isn't "most" crypto.

You said crypto, in general, is mostly untraceable and that's very very wrong.

Monero is the exception, not the rule.