Yeah, he got an income from the government when he medaled in European championships. So it was not a guarantee, though he managed to do this several years in a row in various disciplines. He is now working at the biggest casino in Amsterdam. I don't know if he will come back, but he seemed pretty decided that he'd had enough.
I believe Nicks medal streak at EC was something like 12 years. But in 2017 he finished "only" 5th which meant that he lost his Olympic A-Status (worth 25k in money+tournament expenses covered). He made the decision to retire from pro pool for the sake of his family. You can read about it here: https://www.parool.nl/amsterdam/van-de-pooltafel-naar-de-blackjacktafel~a4565009/?hash=c656894c766eeba480ca49e66fa7e1e87b3e826b