I wouldn't mine a pool from a company that continues to signal for network rollbacks when they get hacked.
As far as I know, CZ didn't ask for blockchain rollback after the hack/s, he talked about how is it possible and what are the pros and cons, and he mentioned "we decided NOT to pursue the re-org approach." Source:
https://twitter.com/cz_binance/status/1125996194734399488Also providing direct liquidity to an exchange likely contributes to a poorer market rate.
The mining wallets are separated from the exchange wallets, your mining rewards aren't tradable until you move them to your spot/future wallets, also given the fact that this is a PPS pool, it simply means the liquidity is already at their disposal, whatever they mine will go to the miner after deducting the 2.5% fees, in some cases they will be paying more than the mine, so all in all, I think this has nothing to do with market rates.
Having said that, the reason why I decided to give Binance pool a go is because I was looking for an alternative to Viabtc, while Viabtc is without a doubt one of the best PPS pools out there, the fact that it's controlled by Bitmain makes me not want to mine there, F2pool surprisingly restrict certain countries from mining, this is th reason why I would love to have a non-China based large PPS pool which sadly doesn't exist.