Anything that sounds too good to be true...
But people are always too gullible. They never really investigate beyond the commercials, pitch or come-on. That’s how they get taken.
Larry Bates pitched a “Mystery Babylon” event which was a financial collapse of Biblical proportions. Many elderly people invested too much of a percentage of their nest eggs.
It’s always the same. Some shyster comes up with some BS pitch to inveigle the unsophisticated. It doesn’t matter what age groups are involved in any scam. They design the scams to fit the suckers. Seniors do seem to be the easiest to scam though and it’s why they are so frequently targeted.