It’s common in the U.S., especially in apartments, to have rooms with no light fixtures. Instead, there will be one outlet that is wired to a switch by the door. That outlet is sometimes upside down to distinguish it from the other outlets. That gives you the option to connect a lamp to the switch to get the same result as having a light fixture. I would generally prefer that every room has a light fixture on the ceiling, but this is marginally better than having to walk across a dark room to turn on a lamp.

I’m not sure I understand. You can stream music for free on Spotify, Tidal, Deezer, Pandora, Bandcamp, YouTube, and probably several other services. Not to mention the thousands of radio stations you can stream. It seems like there are exponentially more music streaming options compared to video. If you’re asking about sites where you can stream without ads, I’m guessing those exist too, but I suspect most people are either willing to listen to ads or pay for ad-free with one of those services.