The Government can already track crypto users with the aid of exchanges since they are centralized, and can answer to the request of the government to disclose the identity of a customer should any need arise for that, tbh, I don't think there should be any concern on the use of cryptocurrencies, Bitcoin is now being adopted by renowned institutional Investors/companies, prominent individuals and the rest, that's quite an indicator that Bitcoin is not a coin for money laundering or the likes of that, but a currency, investment, a hedge against fiat inflation/devaluation, and prolly the government are only concerned cause it gives it's users control, freedom from manipulation, makes them their own bank etc, something that'll never be possible with fiat.
and I will just add, that before the official domestic exchange becomes legal, then automatically personal data and all data of a person's interests will be entered into government records, usually this has been approved by the minister of finance and trade. So the stock exchange manager and the government agree to have data on anyone who is indicated to have carried out a suspicious transaction. So what you are saying is true, no more worrying about transactions being so easily detected. unless the platform is still considered illegal, it will be highly vulnerable as money laundering for terrorists etc. whereas in countries that have legalized crypto exchanges it has become an alliance between the platform and the government.