Probably an unpopular opinion, but I just do not want to have a "business" relationship with google. I would not mind paying for youtube, if it was a separate company. But google does not need my money, and any money the get are used to actively making the world worse (WEI, SEO spam, Search getting worse, ...).
On a separate note, there are reports of people getting their whole google account locked for payment issues, expired cards and such. There is no way to reach a human there, and I really do not want to risk loosing my account I use on my phone as well (android :/) just because some bot decides it does not like me.
Would be fine if I could just have a separate youtube account, but no, that would make tracking harder...
Aaaand there still will be ads inside the videos (sponsored segments), and product placement.