Uber and Airbnb are unambiguous good for the world?

You might want to look up Barcelona and the issues airbnb causes there. Basically it follows out the cities as you can make way more money doing Airbnb than renting to people living/working there.

As to Uber, I'm not sure if the driver experience is unambiguous good. For some, sure. For the ones that depend on it, I'm sure they'll disagree