Apart from all the scams related to education, health or internet services that catch you offering advantages for staying with them (being these a lie), the biggest scam was in the crypto world, but it was thanks to what I discovered: Bitcoin.
It was in December 2020 when an acquaintance introduced me to a project with which she earned money without doing "nothing". Total lie.
Kuailian, is the scam, in the form of a pyramid scheme, in which you deposited ETH (approx €400 at that time) and they returned portions of that ETH to your wallet. For this, in addition, they made me create not one, but several accounts with full KYC (which I fell into), to be able to carry out the entire purchase process from Euros in my bank, to the ETH that I finally sent to their internal wallet in their platform. These applications, later, have gone bankrupt.
The good thing is that I realized it, although late, and I started to investigate. There I discovered the rabbit hole I was falling into. I fell in love with Bitcoin, but I kept trying my luck with shitcoins...
Today, I'm still waiting to be able to get rid of some of those shitcoins, but I feel more like a bitcoiner, and free, despite still using some app with KYC to make card payments (especially online).