Ocean may be gathering hashrate, but not every miner in Ocean filter transactions, though.

> what can be the endgame here? When you run the default relay policies in Knots you get one benefit immediately: less spam in your mempool You also get two more subtle benefits: (1) you're not responsible for relaying most spam to miners (2) you slow down the propagation of spam-filled blocks The latter benefit also gives spam-free blocks a relative speed boost

Less valid transactions in my mempool will make my node unreliable in predicting the next block and estimate fees, especially in extreme cases where it could be critical. Not relaying is the same as not running that node for those transactions, does't stop anyone else. The filtering node slows down it's own to verify blocks - will be later to reach the tip, will waste hashrate in that time if mining. Only the fastest route counts so even a supermajority would not be signficant.