You make the unqualified assumption that these people had healthcare and benefits before driving for Uber. And regardless, unlike child labor these are adults that are making these decisions for themselves. They looked at their opportunities and decided that driving for Uber or Lyft was best. I'm going to go out on a limb and say that these individuals are more qualified to make their own life choices than people on the internet who know nothing about their lives.
Regardless, other countries have these worker protections and benefits for all jobs and Uber drivers don't have them. So Uber is a worse employer than most.
And still, people chose them you would say. Well, the problem with that is that there will always be people desperate enough, or naive enough or greedy enough to jump on opportunities. At the beginning, Uber was paying its drivers more and there were also fewer drivers.
Currently it's a predatory company. And society shouldn't tolerate such companies.
At the risk of going down the partisan rabbit hole, this reminds me of the video segment where Ami Horowitz questioned people of liberal political persuasions on the ability of black voters to meet photo ID requirements, and then asked black Americans the same questions:
He also isn't asking the black voters "the same questions" at all.
Child labor laws prevented parents from sacrificing their children' educations to use them for immediate economic gain. This is not at all related to extending employee benefits to contract workers that set their own hours.