That's because you think flat-earthers "deserve" being cheated because they're stupid. I wonder how you'd react to cons that exploit your own ignorance.

In my ethics it is fraud to keep people in a mistaken belief to profit from it. By adopting their beliefs as his own, he crossed into that zone. If he'd just announced that he'll check curvature for them, that would have been alright.

Flat Earther's are more convicted than stupid. They're more than welcome to give money to anyone they please.

> In my ethics it is fraud to keep people in a mistaken belief to profit from it.

See: all of organized religion.

It's not fraud if you believe it yourself. Sure there are frauds in organized religion, but that doesn't make the religions as a whole a fraud.