Could be. But even if some of the transactions became public, it should be fine as long as the end transactions (crypto -> fiat) is private, right?

There are very few exchanges left which don't require KYC and even then the real final step is cashing to some kind of bank account. I don't think crypto->fiat privacy is possible beyond a certain level of wealth.

OFAC has broadened enforcement to the point that pretty much any financial transaction across the world has a US nexus. Moving that much stolen crypto without the feds noticing? No chance.

where do mention?