In order not to fall into such stories you need to study as much as possible the technical potential of the project and the experience of the team in previous projects.
The trouble is most investors that they invest their money in projects without even having studied these projects. It's true. I know a lot of people who, apart from the name, do not know what they are investing their money in ...
And I know people who ask where to invest money. Most are not interested in what the project is and why it is. They only need to earn and nothing else.