Nature abhors a vacuum, and Uber is filling that vacuum.
Look, you're way abusing that metaphor.
See, "the market" isn't "nature", and "undercutting competition by ignoring laws and regulations" isn't a vacuum. That is a complete lie.
Capitalism isn't a natural law of the universe. It's a belief system which came out of observations about how things were structured. This whole crap about "yarg, let teh companies do as they please" is basically being stupid and ignoring all of the reasons why we have these laws in the first place.
And we have those laws because in the past greedy, shady douchebags with little regard for the welfare of others have decided to act like greedy, shady douchebags. And this whole crap of "people are free to not buy from greedy, shay douchebags" is so so much garbage it isn't funny.
In the same way that melamine laced baby formula in China (and pet food in North America) wasn't a choice where someone could say "hey, gee, I know, I'll save a few bucks and buy the toxic stuff". By the time people know about the corners greedy, shady douchebags have cut ... it's simply too damned late, and people can die to pad the profits of greedy, shay douchebags.
The notion that the market works because people have access to information is a complete lie ... because the people in that market will always be trying to figure out how to fuck over their customers.
The 'market' is an abstraction. It sure as hell isn't some noble construct which achieves perfect outcomes in the long run. The 'market' is amoral, and doesn't give a sweet damn if people die.
Because in the long run it devolves to scams, fraud, collusions and cartels.
Your previous 'market' is a complete lie which has never existed, cannot exist, and will never achieve the perfect outcomes you blindly believe it will.
The rest of us don't want to live in a world where all of the advantages are in the hands of greedy, shady douchebags. And we certainly don't want to live in one predicated on the bullshit lie of consumers making "choices" among lying bastards giving them false information.
Honestly, you have so little understanding of the real world if you really think crap like safety regulations come down to consumer choice and intrusive government. You're romanticizing something which has never existed as you imagine it to be, and which simply can't exist as you imagine it.
Sorry, but you can't run a society on the fucking Ferengi Rules of Acquisition -- which is what the laissez faire capitalists think we should have.
The free market is bloody lie, and especially all of those wonderful outcomes people attribute to it. The market is the collective behavior of a bunch of sociopaths, that's it.