They will never work regular jobs.
Just because the viewers aren't told about all of their sources of income it doesn't mean they don't have them!
They could've gotten rid of one of the cars if there was any financial concern. They could always say oh, you know, Greta Thunberg and all, we don't really need three and the fact that they are actively still looking for staff, obviously doesn't mean that they can't pay for them anymore.
They would NEVER quit youtube unless they can afford to. You think Anna is gonna sit behind the register at Morrions when the alternative is vlogging herself washing her face? No freaking way. Creating quality content for Youtube is hard, but vlogging is very easy. You don't walk away from a gig like that unless you can absolutely afford to.