I don't know.
I assume that most people join this game jam just for the enjoyment. Others probably join for publicity or for the feeling of being seen. This is not a bad thing or a thing that should be blamed; many people have a desire to create social connections at least once in their lives, and game jams (or hackathons) can occasionally be good places to meet new people in.
I personally joined this game jam to feel some form of accomplishment or acceptance. I wasn't able to feel any of those after finishing my game, but I'm okay with that.