In the near future, the vast majority of bitcoins in circulation will be considered "tainted". We could somehow compare this with the banknotes contaminated with cocaine that are now in circulation in the hands of people who have nothing to do with it (Contaminated currency).

It will then be inevitable that exchanges will receive BTC tainted. This is why I have always found it absurd. It's like if they shot themselves in the foot, and many people will end up going elsewhere.
That's also why freshly mined bitcoin can have a premium price since they are "virgin" of any transaction

Nowadays exchanges have more or less the same obligations as banks with regard to AML, KYC, and others.
If it is usual for a bank to ask for the source of funds (and it is), the same applies to an exchange. Despite this fact, people might think that they don't have more authority than banks.


6 transactions for a company, 12 for a government.

It's not something official, of course, I don't remember where I heard that, I might be able to find the source eventually. Maybe in a video by Andreas about Coinjoin, or tainted bitcoins.