Yeah, the advertising platform of one of the most popular websites in the world is "fishy". Google and Bing give away much more than that, are they "fishy"? To answer your question, Reddit ads can wield a great ROI if used correctly, just like on any other platform. However, if you haven't spent time on different subreddits, and have no idea how the users operate, don't spend your money on Reddit ads. I can tell you that most people complain about not being able to sell products with Reddit ads because Reddit users are much harder to convert in general. They are as previously mentioned tech-savvy and pay a lot of attention to detail. About bot clicks everyone is talking about, I have not encountered any of that, but I haven't used ads on Reddit for a year or two just to be fair.