How sure are you that these are scams?
We can never be 100% sure, but that’s true for anything in life. How sure can a person be that their parents actually are their real parents, how can a person be sure that their mom isn’t a foreign spy (or maybe a lizard person).
These examples are of course a bit contrived, but the point still stands: To be 100% sure is almost impossible (without giving them money and see what happens, but even then there is some uncertainty).
But we work on the basis of “If it looks like a duck, walks like a quack, and quacks like a duck, then it must be a duck”.
And several of the criteria we have should never apply to any serious business (like using stolen material, or have inconsistent/missing information).