You are not looking at things far ahead in the future, ocean isn't relaying spam blocks they already make more money than other mempools (proportionally) and they are on uptrend as oppose to others. When a miner is looking for a block other nodes need to make sure this is a valid block, having more suspicious TX increase your latency and lower your chances as an other miner with less fishy TX can pick it up and win the block. This may sound a bit too theoretical BC ocean is still too small and fundry is still too big.