I think I'm not explaining well. Of course there are legitimate GoFundMe campaigns, I'd say most of them are, even the ones I was describing. They are legitimate, but campaigns with very high goals that get met often already have the backing and the entire thing is part of the marketing. Oh look, this company raised 2 million out of no where, it MUST be a good idea, I'll kick some in to. Those aren't scams, but the chances of random people constantly browsing those campaigns and funding ideas they think are great, then funding them into the millions is rare.
To DireWolf, of course people raise money for losses and medical issues, but it's usually not into the millions unless they have some celebrity backing or makes nationwide news or something.
Finally, I'm not even necessarily saying that this is some scam, I just can't picture how gathering a pile of money is going to translate into getting a wall built.