It's a self-reinforcing cycle, people don't want to support small channels with sloppy editing or rough audio, so eventually those small channels grow large enough that they can hire people to handle aspects they cannot. This quality difference and quantity output increase tends to be favorable to them and YouTube so they get recommended more. In turn viewers also expect this absurd quality and quantity output from not only that channel but all others. Then suddenly they're at 64 people.

I think people would be shocked to find out how many channels are ran by teams of people. It's exceptionally common for people to have an editor or two to manage their social accounts or edit for their YouTube/TikTok due to the demand to have daily/weekly content is so high.