That's true for me. I'm not on FB, and even publicly-accessible pages will throw up a "Please login" screen after a few seconds. So I see very little FB content. OTOH, I watch plenty of Youtube videos, and I can see, AFAICT, all of the non-paid content even when I'm not logged in.
Which for me is a big benefit when I'm not using a device that I own. I don't have to worry about logging in at all.
[1] https://www.theverge.com/2018/5/3/17317274/youtube-1-8-billi...
That's what you get when you are logged in in gmail at the same time. It's not like people WANT to log in on Youtube, it's just a side effect of a google account login on some other service.
I think it's something a bit more general: Facebook is all about getting people to do, right now, what's good for Facebook, and it's willing to break things and get in your face to accomplish that.
Youtube, and Google generally, seem to be much more OK with just providing a consistent, approachable service; and letting the users use it naturally. In the long term, that seems like the better strategy because it doesn't burn trust like it grows on trees.