Unlimited days off? Sounds nice at first, but ...

Someone I know from the Internet told me, that he applied at a company which offers "unlimited vacation days" in it's job ad. However, during the interview process it was revealed that they only write the absolute minimum amount of vacation days (20), required by German law, into the contract. I find this to be concerning. As these two statements just differ too much and this sends a somewhat weird message. Especially from a legal viewpoint. As long as the "unlimited vacation days" are not written into the employment contract it's just a marketing statement aimed at applicants. The only legally binding statement is the on in the employment contract - or any other sort of written contract, like an employer/works council agreement. German law (Gesetz gegen den unlauteren Wettwerb (UWG) - or roughly "Unfair competition act" in english) states that advertisements must not be misleading and must be consistent with the actual terms of the contract. Is this given in this case? This alone…