Many years ago when advance-fee email scams [0] became common I was likewise amazed that anyone would fall for them. Then it was pointed out that the seemingly obvious warning signs were a feature and not a bug, they are there to filter out everyone with a minimum of common sense and ensure that the scammers, who are casting their nets wide, only get responses from a few people but those people who do respond are quite gullible. The pig butchering thing is just a different filter meant to trap a different kind of vulnerable person.

[0] https://en.wikipedia.org/wiki/Advance-fee_scam