Not entirely correct. The videos on the channel that aren't DBZA are monetized. The music videos, pod casts, this villain week etc. They're not pulling in the millions that the main videos are, but 300k-1mil on a video is nothing to laugh at. That's on top of merch, patron, and tfs gaming. I mean that's what that video was about last year. They were making enough for this to be considered a full time job. I'd assume that meant 30-50k per person, per year.
That's why they've been doing so many music videos of late, and why they haven't had actual footage in them, in contrast to the first one they did so many years ago. They want more things to monetize on the channel. Nothing wrong with that.