When you look at the aftermath of exchange hacks (e.g. the recent kucoin hack), and see how quickly funds are frozen by various other exchanges, you can see the direction of travel, especially when combined with the uptick of regulatory interest (e.g. BitMex)
Edit: As this is attracting some downvotes, how about some citations.
On Kucoin From(https://www.coindesk.com/kucoin-crypto-hack-laundering) "The hackers have largely failed to sell those tokens on closely guarded centralized exchanges which quickly flag and often block hacked funds."
On BitMex from(https://www.coindesk.com/bitmex-accelerates-identity-verific...) "BitMEX Accelerates Mandatory ID Verification After Charges of Lax Anti-Money Laundering Controls"