As the other commenter said rober has a schedule despite long gaps.

Stuff made here is a weird case, he both has to come up with ideas, and actually make them, if he were to do a constant feed like most others he would probably hurt his channel (either quality would go down or there would be room for more quantity at the same quality), and it's hard to predict exactly how long a project will take.

He's quite a smart man so managing money probably isn't a very big concern for him, his viewers also crave his pretty unique content so upon seeing he released more content, they watch it (also hes pretty good about keeping things ad friendly so YouTube has no problem recommending his videos to subs) so maintaining money/viewers isn't the issue.

The real issue for him is making sure he's still getting recommended by YouTube to new people despite his big gaps in uploads so he can grow more and do bigger and better projects that aren't repetitive to his core audience.