No I haven't use any vpn on for my trading. Because trading on centralized exchangers is already Risky and here if you use vpn it can be more high risky. Because when you use a centralized exchanger, your funds will be on their custody, if you use a VPN, they can take it the break their rules and can freeze your funds. So it will be best to find a platform where you can use that without vpn. Also if it is illegal in your country then you should find another way instead of trading