You clearly didn't read the article, or actually look at basically any energy drink can. The label of the charged lemonade does in fact list exactly how much caffeine is in each drink, as well as stating it contains as much caffeine as their dark roast coffee.
And Googling the label on a Monster Energy Drink can, there is a label stating that the total caffeine content is 120mg with a warning recommending against consumption by children or those sensitive to caffeine.
Not necessarily. Nebula operates at a far, far smaller scope, with an emphasis on quality of videos over quantity, and every user is a paid user. If every user of YouTube was paying a couple bucks per month, they'd be making in the high tens of billions of dollars of revenue per year, several times more than they do with ads. Plus YouTube has a ridiculously huge amount of essentially worthless videos because literally anyone can upload a 10 hour video, so surely their hosting costs are higher per user than Nebula.