Except that they can't. By design, Bitcoin allows a fair amount of entropy even in the plainest of transactions, at least 32 bytes per output.

The harder that you try to censor the current ordinals encoding, the more you force it to adopt alternative encodings exploiting that entropy, that are indistinguishable from regular payments.

While that forces them to pay more in fees, that's clearly not going to stop them.

WORSE yet, by forcing their encodings to be indistinguishable from regular txs, you make it impossible to prune the ordinal data from a full node.