Same reason they do Nigerian prince scams still: it’s so ridiculous no one will believe it except the people you absolutely 100% can get a score off of, so you can send these to a million people easily and they self select into the “easy to scam” group and you only work that one. You automate the cheap part of the process (initiating the scam) while making the expensive part (chatting with the mark) more productive
That’s the way it works. I had an uncle with multiple sclerosis (spelling?). He used to get his PC infected with all sorts of ransomware back in late 90’s. For him credit card was the answer, luckily his siblings mostly got somebody to clean the shit up.