Because the difference in fee revenue won't be high enough for some ideologically minded miners to care. Though I'd be happy to bet that Ocean fails to get more than 10% a year from now, while also continuing to block "spam".
Could you imagine if they got even close to 10% of the market share in 1 year?! That would be insane.
The other benefit of Ocean is that it's much easier to verify how much fee revenue you're actually getting. Though miners can also just A/B test their hash power to figure out which pools pays better. But they're also missing out on out-of-bound payments by not having an accelerator.
That benefit is something that a non-censoring pool can easily replicate.
Indeed, in the podcast episode we introduce the idea of Ocean 2 for better comparison. But right now there is no Ocean 2, though we did not get into arguments about market efficiency :-) https://bitcoinexplainedpodcast.com/@nado/episodes/episode-86-ocean-tides-hktbg
I've actually bet play money on it having less than 1% at the end of the 2024: https://manifold.markets/harding/will-oceanxyz-find-1-of-the-final-1?r=aGFyZGluZw (A pretty easy stat to fake, so I wouldn't put too much stock in it)