The most serious effort I've seen had a geoblocked website that worked with a Chrome plugin. You could get around it, without even using a proxy, but only if you could understand the smart contract code and figure out how to prepare the data it required.
To my way of thinking, if you're sophisticated enough to do that, you're sophisticated enough in blockchain matters to make your own investment decisions.
To my way of thinking, if you're sophisticated enough to do that, you're sophisticated enough in blockchain matters to make your own investment decisions.