It's doubtful that anyone would fire an employee looking at fine art. The more realistic issue is that some coworker might be walking by and catch a 0.5 second glimpse, think they saw something that they didn't, maybe turn it into a bigger thing or at least start a conversation or two about it, and months later maybe a boss is less inclined to give a big raise or promotion, because there's a sliver of a worry that this person might be problematic.

It's never as black-and-white as "boss walks by and fires person looking at art."

It's so overly zealous that I can't even understand about what is NSFW referring to.

No, there were photos of people smoking.