First, bitcoin is a business and I believe almost all of the businesses have their own risk but I suggest that you need to know and understand first what kind of campaign you are joining.
Second, people would really know if the money is legal or illegal, you must always be a vigilant for everything you do. Think first before you do something.
Third, you yourself can actually secure your own business or your account all you need to do is to make sure that you know the rules and regulations.
Bitcoin is a business so don't expect that it is always goes up.