Their campaigns have fake reviews
I recently saw the first newsletter from them. Trustpilot doesn't allow links so I can't share exactly my research, but I reviewed 2 of the 3 reviews they allegedly had from clients. From a quick search, 2 of 2 reviews were fake, client Edward is a picture stolen from an insurance campaign, and client Linda is a picture from an Amazon frame. Everybody does it, especially start-ups, but if you have well-established results you wouldn't need to do fake client reviews. At the very least spend a couple of hundred bucks on the fake reviews pictures, don't just grab them from the web!