A sign-up wizard that splits up users' PII entry so they are invested in the process by the time it asks them for the valuable stuff is a good UX tech example.
Spam messages that pretend to be bills or from an authority are well into dishonest territory. The key difference seems to be in the honesty of the problematization. It's a continuum.
The best hustles play on the target's conceits, the worst on their virtues. 3-card monte plays on greed and a sense of superiority.
Business ones are basically blackmail like, "everyone thinks you're a smart problem solver who is easy to work with, if you want that to continue to be true, you will solve this problem for me, I'll let you know when you're finished." Less tech oriented, but the leverage pattern is similar.