Haven't heard of this before, but after some research they willingly didn't comply with any of the regulation. They allowed money to enter from US bank accounts. Binance has verification for the Fiat onramp for UK citizens. What i was discussing above was using already purchased crypto and trading it on binance on a VPN using leverage/Margin. A.) pretty unavoiable and B.) pretty untraceable.
The USA did exactly this with a large publicly traded UK company. They arrested the executives the moment they touched down in the US on a transfer flight.
The CEO is now going to jail: https://casinobeats.com/2020/03/26/pokerstars-founder-isai-s...