Or because a bit of whimsy is too much for miserable people?
I too looked at this page a few years back. And I was not impressed. I wouldn't find it appropriate for e.g. a medical company which does "serious" stuff to very rigourous levels of quality controlled design and verification. But equally I don't think it's appropriate for this company either. Maybe a games company which is focussed upon making things which are fun. I think we will have to agree to disagree on its appropriateness.
As for judging people based on their actions and output. It took them over two and a half years to update their images for Ubuntu 16.04. Where are the Ubuntu 18.04 images? It's nearly a year already. Maybe I'd have a better impression if they could maintain their service to an acceptable standard. As it is, this lack of timeliness was a huge letdown, and cause endless frustration and setbacks on the teams I worked on who depended upon these images being up to date and not full of incompatible language and tool versions.