It's official in Copenhagen (possibly more of Denmark), although it will have been unofficial for much longer.
> Residents of Copenhagen can recycle their waste at a recycling station or a collection point. A collection point is smaller, only accepts certain types of recyclable waste and is accessible by foot only. Both types are staffed and most have a “swap stand” where you can donate or collect items which are still usable. [1]
In addition, most apartment blocks have a small e-waste bin. That's big enough for something like a computer screen or laptop; larger things should be taken to the recycling station.
I fished a MacBook Air out of my block's bin, and sold it online for €150 or so. I kept a Kindle I repaired, and gave an old iPad to a friend. This was a couple of years ago, I think there's either now someone else looking in the bin for good stuff, or a wasteful neighbour has moved away.
(A typical apartment block has bins for cardboard, paper, metal, mixed plastic, electronics, batteries, glass, hazardous waste, food (for compost) and non-recyclable waste.)
[1] https://international.kk.dk/live/housing/settling-into-your-...