I had to think about it a bit, but I think in the end it's probably due to a couple bad experiences at startups. There's a lot of toxic, authoritarian company cultures out there that hide behind the idea that in order to be a good coworker you need to upbeat, peppy, and thrilled to be working at all times. It seems to go hand in hand with the (usually toxic and exploitative) work hard/play hard mentality.

If I were required to use this at work, I would instantly view it as a yellow/red flag that management is starting to get heavy handed about team culture, and I would probably start resenting it.

My ideal company culture is pretty minimal at this point: friendly people, a healthy work/life balance, and coworkers who are open to/good at learning - because that's what I strive for myself.

I'm probably coming off as a curmudgeon, and like I said maybe it's just due to some bad associations that come to mind, but this seems like it's starting down the path of "look how much fun our employees have at work!" My $.02.

That being said I wish you luck, and it seems like a neat option for more social settings.