CoinJoins don't store data, they just look like regular payments with multiple inputs and outputs. But the argument isn't about what CoinJoins do technically. It's about who gets to define 'legitimate use.' Once you accept the premise that miners can filter 'non-monetary' data, you've handed them a veto over anything they decide doesn't count as money. Today inscriptions because they're obviously data. Tomorrow CoinJoins because someone argues privacy mixing isn't 'real' commerce. The precedent is the problem, not the current target.