You can't tax every crypto trader and holders. How do you tax people trading defi on decentralized exchanges and selling on P2P using escrow. It will really be difficult. Currently, my bank doesn't know the source of my credit, it's not tied to commodity. Censoring crypto is very complex.
For now they can’t, and they will focus more on centralized platform to know every single person who are into cryprocurrency and that’s where taxation begins. Sooner or later they will require everyone to report crypto profits, this could be more good than to ban cryptocurrency at all, we will deal with this soon.
Good luck with their government if they could do that since in the first place they don't want crypto to be used a means of payment. There are many ways to avoid being in the list of centralization so I wonder how did their government plan all of this making exceptions and consideration.
The tax isn't that big and anyone who are holding won't get taxed