As you probably already know, flat-Earthers are dumb. They literally believe the Earth is flat, and that everyone who says otherwise is lying to you.
The rise in belief in a flat Earth is one of the strangest phenomenons of this generation, especially as we have more evidence than ever to prove them wrong.
Still, people are free to believe what they want. They’re also free to issue challenges, and offer $100,000 to anyone able to complete them.
What they’re not free to do is then refuse to pay out the $100k when someone duly completes that challenge, making them look like a complete muppet.