It is not illegal, it comes with strings attached because in general, in the EU ...

pfortuny on Feb 11, 2022 | parent | context | favorite | on: Booking.com is moving its customer service staff t...

It is not illegal, it comes with strings attached because in general, in the EU the employee is seen as being the weak side of a contract, and is protected (to a point) against arbitrariness from the strong side.