For me this is risky. If a company or a service is banned in my country I wouldnt try do something like this especially since my money will be at risk. Binance banned US users from using their exchange, if someone in the US uses this trick to access Binance and begins trade. There is a possibility that your browser may have a glitch and Binance blocks your account. What do you do?
The fact is, with KYC mandate on binance exchange the user will not be able to access the exchange as a US citizen, because at a point he will need to verify the account before being able to make any trade on the exchange.
So I see this as a total waste of time because in the long run, he will need to verify the account at some point.