They basically did the same thing the Satanic Temple often does. Use the rules republicans make thinking only they will benefit. When they are used by the other side as well it has a funny way of causing a reevaluation of if it should in fact be legal after all. My understanding is that CAH made a sort of parody of Musks trick although doing it in a slightly more careful way to make sure that any legal action against them would apply more broadly. I don’t think it’s good that vote buying is a thing, but equating the satirical protest campaign with the actual thing being pushed against is unfair in my opinion. You can argue if they go about it the right way or not but legitimizing the original offense by pointing out people cheered at the counter campaign opposing musk using the same tool and humor feels disingenuous.
Dave McKeegan isn’t who offered to fund a flat earther. He was himself funded by the guy who arranged the whole thing, same as the flat earther was. Dave McKeegan was simply a prominent debunker with skills as a photographer who accepted to take part in this venture.