Is it illegal just to have a onion site running in the first place? That would be a cool thing to try but I am scared to dabble in that stuff.
Well, it depends on the country you're talking about. In Brazil, for example, there is no law against such thing. Problem is what you'll be doing with that site. I don't understand much of it, but it seems like in Tor you might end up being messed into business you had no ideia about in the first place. So it's something to consider as well.