> Its not really though, if the majority of PoW miners want to omit a certain miners blocks, they can.

Censored transactions can hire/pay miners who won't censor more transaction fees, to encourage them to include the transactions in a block. In other words, since transactors pay miners, transactors are customers of miners.

There is an open market competition– any miner censoring transactions will lose higher fees from people who send censored transactions.