Large pools have censored transactions (f2pool recently admitted this) and Luxor mined a block earlier this year for virtually zero onchain fees but took payment via side channels, thereby screwing all the hash providers in their pool. The reason they can do this is because they create the block template in obscurity so hash providers can't see the block until it's mined. I'm not saying Ocean is perfect, but at least they show you in real time their block template so when they do find a block, there are no surprises.