What are the chances this survives a court challenge? Story: In a previous life I worked as a consultant in Sweden. My employer had a clause like this in the e

What are the chances this survives a court challenge? Story: In a previous life I worked as a consultant in Sweden. My employer had a clause like this in the employment agreement. I quit and joined a company that technically was a client. My previous employer tried to make a legal thing out of it saying I owed them money, but backed down with a sternly worded letter from my lawyer. My lawyer roughly told me that "they can't block me from earning a living without offering me the same amount they're trying to deny me to earn". Sounds like a very fair law. Wonder if it's still like that? Was some time ago.