I don't agree with you, but let's assume I do. What next? All of those business fail and... Low skill workers now make zero instead of something >= minimum wage. How is that better?

A healthy society will offer a safety net to people without jobs and also the ability to retrain, find another job, etc.

You're assuming an unhealthy society, which unfortunately matches the US, but also many other so-called well-off countries: social protection diminished or outright removed combined with job uncertainty and social inequality.

Having one or two Ubers allows you merely to pretend longer that the situation's not dire. The political turn to the right in Europe right now and the election results in the US can be at least partly explained by the fact that people are sick of it.

Only if you're enforcing the "livable" wage. Those people who would be working for under your "livable" wage would still be out of that money though.

for these sorts of low-value jobs, something has to give - either employees don't get a livable wage and the business survives, or the business doesn't survive due to too high wage cost. The option where the business survives, but also pays a livable wage, can't exist. If it could, then a competitor could also out-compete them by just not paying a livable wage!

What does that say about all of the money losing startups that are living on VC funding?