Except for these people, it almost definitely is. They have staff, an office, inventory to manage, etc. Most YouTubers nowadays aren't just operating on their own, and thus have financial expenses outside of just paying themselves for their own labor, that can't just keep going if their revenue stream goes down, or even just takes a large enough cut.

It's unfortunate, but that's just how a lot of the content creation industry works right now, especially on YouTube.