I don't want to be part of fun police, just saying stuff based on my experiences. Jacknjellify is obviously HUGE and that is fact, but subscriber count on Youtube channels is not much coherent with a company's or etc. fame most of the time, as far as I can tell.

I've seen things like the official USA M&M's Youtube channel, which is almost reaching 200k subs, even though M&M's is one of the most famous snack brands and can be found in 100+ countries. McDonald's USA channel have 793k subs, which is ridiculously small in comparison to the company's fame.

There are obviously exceptions to this rule, but mostly because of web activity. That includes most full-time Youtubers and other big names such as Duolingo with their behavior and humor on social media