Yes, you have holidays, paid medical insurance, paid gym, 1 month notice period both ways etc. No one will put extra hours on him etc. In this sense the CEO is

Yes, you have holidays, paid medical insurance, paid gym, 1 month notice period both ways etc. No one will put extra hours on him etc. In this sense the CEO is right, this guy is a troublemaker. He just joined an outsourcing company, a "bodyshop". It's just putting your energy into something perpendicular to where he has to. As CEO mentions, there are ways to escalate many things, and in Polish culture escalating and raising questions slowly is expected. There was practically nothing for him to gain, so it is perceived as something inappropriate. Even though it's a perfectly legal thing to do, of course. And he's fired "bez zachowania okresu wypowiedzenia", so without a paid extra month, that's a bullish part from the employer, if the guy didn't sign the document, he probably is going to sue.