My point is that XMR transaction cannot be analyzed for "AML risk score" like other cryptos like Bitcoin and Ethereum. So an exchange cannot arbitrarily ask for KYC if detected user's coins as "dirty".
They don't have to first "analyze" for "AML risk score" before they think about asking for KYC. They can ask for it at any time they want, and a trader is forced to comply if they want their money back.
The point is, if you don't want any KYC inconvenience. Avoid any exchange that mentions KYC or AML in their TOS regardless of what coin you are dealing with.