Regarding the current domestic policies, issues with USDT merchants, cashing out, and funding in,

Let me raise a question and see if anyone has a solution.
That is: if the authorities start cracking down on USDT merchants domestically and cut off the source, how would they do it? The most effective way would be to send a group of people to register accounts on major exchanges, then go from the top down through all USDT merchants. By making just one transaction, they could obtain all the counterparties' information and directly summon them for questioning. Wouldn’t this completely clean things up?
So far, this hasn't been done—just some token gestures? Why hasn’t this approach been taken? What are the pros and cons? Will it be done in the future? If it happens, how should we respond?
Since Bitcoin is defined as a commodity, buying and selling a commodity shouldn’t be illegal, right? Don’t use USDT anymore; just buy and sell BTC in C2C transactions. What impact would this have on BTC? The impact would be that the current supply of USDT couldn’t be quickly converted through C2C, so the fastest way would be to exchange USDT for BTC, and BTC prices would skyrocket. For newcomers to the crypto world, they would have to buy BTC first, which might make BTC ownership even more widespread.
My bold prediction: exchanges will soon prioritize BTC C2C trading, maybe even put it in a prominent position for users to get used to it first.