YouTube's been profitable for a few years now, but for sure running a video site isn't a walk in the park either and people gotta get paid somehow.
YouTube Premium is an answer to the creators complaining about inconsistent revenue and undesirable ads running on their videos, as well as anti-ad privacy advocates (with ads targeted to kids drawing a lot of ire.) For over 10 years, ads were the only way to make money on the site, and not everyone liked that. Tech nerds in particular used to say a lot "if there were a way to pay to get rid of ads I'd do it in a heart beat! Google is being so stupid."
YouTube itself is one of the greatest achievements of modern humans. Go to this website:
http://www.everysecond.io/youtubeIt's staggering in scale. In any other era people would be forking over money hand over fist to get access to YouTube.
The solution today if you're unhappy with YouTube and wish to deprive them of revenue is to use another service.