Grammar is not the only factor by which it is possible to identify such people, but if it catches the eye, it becomes clear what was being done on the knee somewhere, who knows where. This is good because a lot of people will be able to avoid wasting money and time by dealing with it. But the more comprehensive analysis we subject projects, the more chances we will be able to avoid problems. Grammar is what lies on the surface.
But it one of the big factor to determine if the project is made professionally although it is subjective as usual.
Just to have a quicker hint, you'll get to have the idea that you're investing to the wrong thing that's made by the scammers. Don't be deceived and only deposit to the legitimate exchanges or projects.