No kyc, availability of coin I want to trade and somewhat reputation, so I don't get scammed the moment I deposit funds.
I don't go to cexes as I often I used to due to rise of instant swap exchanges, dexes and perp dexes. Still, on occassions when I don't have enough gas for approval plus confirm transaction (dexes require two confirmation, you can do 'appove all' but that can turn out deadly if exchange gets hacked).
For example, just a couple months ago I went to MEXC because I was airdropped a coin and my wallet didn't have enough funds for DEX to make approval/confirm transaction, so I sent it to MEXC for trade.