It could be. Depends on what UTXOs your using. It's strictly better than Visa though imo... But I understand where you're coming from. It's one less party who knows what you're doing. In case A: you use visa and visa and the airline and cheapair know where you flew In case B: you use bitcoin and cheapair knows some info. But only the UTXOs you share are doxxed and if you coinjoin with someone else it mitigates it somewhat...

Or use Sparrow wallets & Samourai wallets inbuilt "self" coinjoin where you use twice the inputs to "pretend" to be doing a coinjoin with someone else. But it's really yourself.