I’m wincing a bit at the word choice. In the old days, “hack” meant to just slap something together to get it to work. “Just hack something together” was a directive to get the product through the upcoming trade show or investor meeting or whatever. A “hack” is not intended to be in the final product. “That’s a good hack” was a compliment, but it was also a recognition that it was still a hack.
But “that’s a hack job” meant it was bad. And of course, modern parlance is that hacking is malicious, &c.
Maybe “brainstorm a thon” or “contribute a thon” or somesuch . But that doesn’t quite have the same snap of course.
Personally, I think they're very effective ways of looking at a problem differently and coming up with solutions that would otherwise not be proposed.