How to protect yourself from unscrupulous investors?

Suppose you have a project. You worked it out. You know when to buy what hardware and software, at what stage what risks will be, what kind of personnel will be required, how you will work with the audience, where to get it from, how to keep it, what to sell to it. You know how you will make money. There is a business plan. There is a presentation.

Looking for an investor. They, of course, ask for information. You send it to them, they say “not interesting”, and after a while the same project appears on the Internet ...

Has anyone ever been in such situations?
Are there any blacklists of such "investors"?
Any ideas how to protect the project from "hijacking"?