Quick bit of info for other creators who like to have Youtube open when you do creative stuff:
They are making background play a premium feature. This includes desktop too.
What that means is, if you have any video playing on your computer (doesn't matter if Windows, Mac, or Linux) and you switch from your open browser with the active Youtube video to your art program, it detects this and stops playing that video. It also doesn't matter what kind of video you want to watch, which is especially annoying if it's one of those 2 hours long ones that are specifically made to be background noise. Or if you turn off your screen, like you would do when you play rain sounds to help you fall asleep, for example.
They're apparently still in the testing phase, so not everyone has this - let's call it an update for now- but there are enough people online reporting the site going dark that it's noticeable. In turn, that means this new "feature" is coming for all of us sooner or later. So, please, if you are having trouble with Youtube lately it's very likely this and refreshing the page or blocking the page visibility API might help. It is not your internet being broken, no matter how hard Youtube is trying to gaslight you into thinking that.
For the Sims community in particular this means that you won't be able to watch speedbuilds or tutorials while you play the game anymore. At least not on the same device. Again, this is on Youtube (which is intentionally breaking itself right now) and not your computer or wifi.