I was a fool and I believed that I could make a lot of money. In the end, I lost all my money.
At least, it's good that you acknowledge your mistake. I hope that you at least learned from it and never ever dive into similar schemes again.
I wonder how many such fools like me?
Plenty of thousands.
Are there people who have earned on this?
YouTube shills mostly and the sick minds behind BitConnect. It's not for nothing that the YouTube shills in the end deleted most (if not all) of their content to prevent complaints, legal cases, etc. They were promoting something from which they know it was very likely a scheme, and that with their face on internet. They literally sold their sould to the devil, and as always, nothing good comes out of such practices.
Some people could have recouped at least a certain part of their investment, but they were stupid enough to reinvest. Just as with cloud mining,
never reinvest 'earnings' since it will force you to start earning from scratch again.