@schratze there's a 70s SF novel called Gravitor (Hugh Darrington) that, among other things, is about how all of society has to wear a wristband (much like a smartwatch) that's connected to their bank account, and all public amenities (houses, phones, internet terminals) require a symbolic payment of 1 credit, and the protagonist has his forcibly taken from him, which permanently exiles him from society.

Seems a little more real every day.