how are you planning to circumvent the Steam ban on gambling CSGO sites?
if there is a midleman involved,then you,technically, have to run two or more sites-
one for the gambling frontend and another one (or more) to store the skins and accept money and provide withdrawals
if there are any legal problems how would you be able to return the invested money?
Valve and/or Steam put a "ban" on gambling, or intended to. What their rules state is there should be no trading into third party skin value markets for csgo, but how betting websites get around that is by making a middle site for deposits and withdrawals, that way you are not breaking their TOS in any way. There is actually nothing in their TOS that specifically states there are no gambling websites allowed... And you don't necessarily have to have a third site, you just need to set the bot up in a way that the user sends the trades and confirms them. Although I do have a middle site already set up IF it is needed.
If there are legal problems, the profit that the site had made will be distributed among the investors based on their prior investment, but there will doubtfully be any legal problems as nothing wrong has been done.
Let me know if you have anymore questions or conerns.