It sounds a little implausible at first, but Adform serves like a billion views on European consumer websites. For example, a state gambling monopoly: https://mstdn.social/@GossiTheDog@cyberplace.social/11701780... The attacker only has to get lucky once

Another comment noted over 100,000 USD passing through an associated wallet. I don't know how much work went into this but my hunch is it has paid off pretty good even compared to legit tech work.