Just speaking personally, I probably watch at least an hour of YouTube video daily, but I'm feeling less inclined to spend time on YouTube lately, due to all the ads and creator community hijinks. I've even considered hosting my own videos at sites like IA from now on. So while the big numbers look good, I'm personally more concerned about YouTube's future.
https://www.theverge.com/2018/5/3/17317274/youtube-1-8-billi...
As for their profitability:
https://medium.com/@intenex/where-are-you-getting-hard-data-...