Other pools are essentially borrowing your hashpower. The pool operators make all decisions, build the block, and recieve the rewards. They divvy out to the "miners" (more appropriately shld be named hash lenders) as they see fit based on the pool rules they decide.

Ocean allegedly does not custody the rewards. They are sent firectly to your bitcoin address. They are do not borrow your hash but instead you are split a proportional amount of rewards based on your real-time hash rate (not a moving average) directly from the coinbase. Stratum v2 gives miners (more appropriately named in this case) the ability to select transactions and take that decision away from the pool operators.