If Tim and Jenn want to burn through their money as fast as it comes in, that's on them. They can hire all the people they want to clean house, take care of their kid, whatever. They can buy horrible pieces of clothing... no skin off me.
They can make the decision to leave their miracle child home alone in a house filled with strangers, telling the baby sitter she has to watch not only their child, but the strangers too. It's excessively odd, and I'd have something to say about if I were the sitter, but whatever, not my life.
It's when they whine about their own piss poor behavior and video advice blaming "the unwell three" or another vlogger for their own demise, that's where I stick the masking tape line down. Lack of responsibility within your own household is one thing, extend it to the general public and make money off it? No.
A note aside from all that: it seems Jenn and Tim are quite comfortable with strangers in their house now. Have to wonder what other services will be arriving.