I would agree with those comments on reddit. I would add that different jurisdictions may have different laws but I would be more concerned at this stage, not about the legal implications but about the image and reputation issues.
Let me explain, at the moment if I promote a store on ob it appears next to listings for things I don't want my brand to be associated with. I am not suggesting to restrict what is for sale but it is a concern for me. Not sure what the answer to that is. Its probably an concern that will disappear when there is more volume on ob.