This article provides more examples. They wanted to stand out in a community that has become known for its excesses.
2 freaks, at the very very very least.
People who haven't even been interviewed let alone hired getting a company brand is one thing. But coworkers (and likely friends) getting a company tattoo after getting hired seems completely plausible, especially if it has grown successful into a unicorn.
unless he had exactly 3 employees, I'd say it's freakish.
That show was created by the creator of Office Space. They were both fictional and satire. Just because it was popular and there were some nuggets of truth in the jokes doesn't mean that every startup in Silicon Valley is as extreme of a cult as WeWork was.