What sort of money do you have access to, to set up such a website ? It would have to be a lot ! And consider if you are too successful you won't find a broker willing to lose money to it for very long.
Well etoro have a system where people follow any traders they like - all real accounts. They (a broker) make money on every trade , just like any other broker. so why would a broker be unwilling?
I think it depends if the broker is an ECN, doesn't it ? Most brokers according to the general info make their own markets and therefore can't afford to be on the losing side too often.