A lot of them are crypto scammers. I encountered a ton of those when I was on dating apps - they'd get you emotionally invested by just making small talk, flirting, etc. for a couple days, then they'd ask about what you did for work, and then they'd tell you how much they make trading crypto. Eventually it gets to the point where they ask you to send them money that they promise to invest on your behalf and give you all the profits. They simply take that money for themselves though, obviously.