Believe me, I've also learned my lessons the hard way, scams everywhere, maybe I should set up a website for checking fraudsters.
If I see a new site then I'll go with kinda checklist for not stepping into another BS.
Here are some sites where you can get an overview:
https://www.scamvoid.com/
https://badbitcoin.org/thebadlist/index.htm
RE: Bitcoin Investment opportunity