Depends on what you consider "top tier". 26 subs with over 20 million subscribers are private or restricted. 86 subs with over 5 million subscribers. I was too lazy to count, but there's several dozen more over 1 million subscribers and a ton over half a million.

I'm skeptical they can afford to lose all those subs or replace their mods.

source: https://reddark.untone.uk/