Do you realize how backwards that is?
All throughout history it's been the case that circumstances change. Maybe what was a viable business to start before, isn't now. Well, those that took the chance when this was allowed are banking on it, but now no one else can.
Your argument is: person X exploited bad thing Z before, so we must continue to allow back thing Z just in case person Y also wants to exploit it. No, that's completely backwards.
Some people got rich off slavery, so we shouldn't make slavery illegal because my startup wants to take advantage of it too. /s