Social Unrest?

So, basically, maids would still be paid less than 10% of the wage of those they clean for, as they'll all be self-employed contractors hired by an agency who only directly employ a few office staff.

It's not that simple, as it's often easier for the companies hiring to go through an agency. It solves them having to search for new people pr keep track of anything - one target person at the agency to communicate with and a succession of faceless drones come to do your tasks. From experience, this is how at least some industries work.And if we cut out the agency it doesn't solve the central problem. Any menial task which lots of people can do, and so which can't demand a high wage, can be done on a purely contract basis - without ever hiring an employee that you're obliged to pay properly.

Sadly, I don't have any suggestions, only criticisms. I've no idea how to make a fair or stable economy. I just suspect that most people with a Grand Plan To Make Things Better are missing some of the complexity of things.