The only explanation for the low participation I can come up with is something Malcolm Gladwell wrote about.
There was a famous case in New York where a crime happened, dozens of people witnessed it, and nobody called for help. The explanation wasn't that city people were less caring. It was that everybody assumed somebody else would surely do it.
This challenge feels a little similar.
If you offered it at a local club, half a dozen players would probably give it a shot immediately. Free entry, free money, and useful practice.
But when the challenge is presented to a worldwide audience of 330,000 YouTube subscribers, most people probably look at their draw game, assume everybody else is better, and conclude they have no chance.
And draw shots have a special reputation. Even Efren Reyes — arguably the greatest player of all time — was relatively weak at his draw shots compared to the rest of his game. Whether the story is fully true or not, many players seem to believe their draw game is one of the weaker parts of their skill set.
So people assume that somewhere out there are dozens of stronger players who will post great scores, and they don't want to publicly post a mediocre one.
Ironically, if enough people think that way, a challenge that should attract hundreds of entries ends up with only a handful of participants.