It can't learn my interests if I don't see any new videos though. As I wrote, it's just the same over and over and over again. Usually one would mix in something completely different...which it doesn't do. That applies to the content and the music. And it's not like I'm not interested in things. On the contrary, my interests touch a large variety of topics but I never get a book recommendation, classical music played on different instruments, sports etc etc.
Actually, it starts you off with your native language only at first IIRC. I increased it to seven different ones which didn't matter at all and then decreased it to three. And again, no difference.
I don't use any social media and all the "celebrity" stuff is generally not for me at all. So I can't really compare the experience to anything.
Though, I guess I can attribute the success to what the others said, despite its demerits:
- really low barrier of entry (mrkramer)
- organic feeling, as opposed to corporate-controlled/generated (alexgmcm)
The addictive nature of seeing what comes next likely also plays a role.