Presumably Forrest has limited recourse against the advertisers because they're behind shell companies (or similar) in countries with limited legal consequences

Presumably Forrest has limited recourse against the advertisers because they're behind shell companies (or similar) in countries with limited legal consequences. As a result, I can't see a solution that doesn't involve countries requiring publishers to filter advertising sources. I'm guessing this sort of thing isn't politically urgent or important so the public is left dealing with the mess. Without an ad blocker, I can't see how you could even start to escape scams getting in your face.