Usually people mean the EU, and there is lots of EU level law.

They even do it in the UK, which is weird "Here in Britain, we drive on the left, and in Europe they drive on the right"

> Europe consists of plenty of countries, all of them different. It seems like statements on HN about how it is "in Europe" is usually Americans writing fan fiction about some never-never land.

Yes, this is a common trope on HN (and the Internet in general). People have selective memories, and it's easy for people - unintentionally - to remember the most favorable laws from individual countries, stitch the together in their minds, and then form perceptions on the composite image. It's generally not conscious, but it happens pretty frequently.

And in some cases - such as this one - people are just flat-out misinformed about the situation in Europe. (As pointed out in other comments, this is legal in the EU, subject to comparable restrictions as it is subject to in the US). It's not surprising that a feature Slack is marketing specifically to business users is, in fact, legal for businesses to use in one of their largest markets.

Hadn't thought they were actually Americans, since it's usually critical of the US. That explains why they never mention which country they're from.