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>Their CEO revealed they have 1.8b logged in users

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.

Sizeable and minority are two totally different markers of scale. 25% of something is a sizeable chunk, but still the minority...

But do they log in consistently? I log in by mistake every now and then, but I use it without being logged in 99.9% of the time.

This isn't a huge percentage of the time for me, but I often use a device that isn't logged into anything because it's using the android builtin browser, someone elses computer, etc. Not having to care about logging in is a benefit.