Why fork the codebase if you aren't going to put consensus limits on open_returns then? Based on my current understanding this change doesn't seem like a big deal. I want mempool on my node to show me the competition for the next block as accurately as possible. Now that this has become as popularized as it has, with core changing, anything on your side is purely symbolic. Even if core drops the PR, arbitrary data fans will use miner accelerator APIs and do it anyway. Core still ran the worst public relations campaign I have seen in a long time, but that is a separate issue.