If you are a company and run a webstore, it could be mandatory that all funds must go through a wallet where the tax authorities have a view key. This would be trivial to enforce with penalties whenever for publicly using addresses that point to other wallets. Peer to peer transactions (for eg. used goods or produce from your garden) are already except from taxes in my jurisdiction, so these transactions can be private.
Do you what to know the best part about xmr? You can kick and scream and bitch about me using it, but you can’t do jack shit about it. Maybe you can lobby at the side of paypal for more regulations, until the enshittification eventually catches up with you. glhf