Nope, they ARE all faked ads. I'm really not sure why anyone would think otherwise. The only exception being the CS gambling sites which turned out to be owned by the guys making videos/streams showcasing them "winning" (with fudged probabilities it tuened out).
Today I tried to make a move there, but I ended up stopping halfway. There are some types of, let’s say, bets there that are somewhat ridiculous. This market should be a bit more regulated and have some common sense. Unfortunately, I’m seeing betting houses being more sensible than the new model of prediction markets. And it’s a bit strange to say that.