we have fully anonymous, working cryptocurrencies now (monero is the best example). You cannot link transactions nor determine the balance of a public key. without the private key and transaction key no court can seize.

we have anonymous darknet markets, where you can buy many controlled substances, in visibility of law enforcement.

My point is that you can't uninvent these things. They have already changed society, and moralizing on how we shouldn't invent these things has gone way past into heavy production.

Use the technology, dont use it; this is really the only choice you can make. Their existence wont go away.