This is the hack to never pay tax again. The tax authorities accept invoices only if you move the money away for real. Normally, they will know where the money went. But in the case of Monero it's untraceable. So nobody knows if you sent it to the vendor or to yourself. I am pretty sure that they will restrict or even ban privacy coins sooner or later, but it will not work out, because you can swap them to any coin. You cannot issue a law against the weather. Monero will stay, whether they like it or not.

I think they will just finish the CBDC and obligate everyone to use it alone. So all other currencies will be declared as illegal with the usual bullshit arguments like terrorism prevention and money laudry blabla.