OK thanks interesting, although I would like to add that I did not address trying to identify and punish reviewers on Glassdoor, which may or may not be illegal all over Europe depending on the nature of the review. That point I tried to make was that the GP was exaggerating when painting the US as an outlier regarding the rights of employees of not to be monitored.

The US is more "employer-friendly" if you like, and much less complicated to fire employees (boo!) compared to Europe - yes. But generally not categorically different when it comes to the right of employers to snoop on their employees, which people here might want to be aware of.