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

Are they?

Uber is a major driver of the gig economy and all the lack of worker protections that that includes.

They’re also arguably a major driver/originator of DoorDash and Uber Eats, a company that famously takes an enormous percentage of every restaurant’s order fee, compounding either the increase in costs of restaurant food, or causing restaurants to struggle further or both.

They’ve done good - they’ve made it easier to get a job when you otherwise can’t, and they’ve reduced car reliance for some people; but “unambiguous good” is too far a bridge.