The difference with Uber is that it requires a lot more trust to give someone access to your home while you're away to clean it. Not sure I would want to subscribe to a service where I would have to trust any local dude to visit my home. It's like a nanny. Picking someone to look after your kid is a very personal thing. It's not a lowest bidder thing.
In one case you're risking personal items and privacy; in the other your life is actually in that person's hands.