Some people prefer more exchanges because they do not want to have their trading coins only on one exchange, they prefer to distribute the coin on more exchanges. This is because they think an exchange can be hacked and they do not want more of their coins to be affected.
Seems like a really weird way. You want to trade, then you sacrifice your KYC and you sacrifice coin ownership, but you try to find the exchange that is best suited to your trading and most likely to keep your money safe (but this is always arguable).
I mean in this case I 'trust' Binance because they have funds to back up loss to hacking (SAFU) and already proved this before paying back people even after hack.
Why would you want to risk money on other unproven exchanges?
But anyway, I will never understand some 'traders' I guess.