People work and sleep in factory floors during periods of overtime in some places in China. In the most competitive tech companies, they worked 996 until the government stepped in.
All of this bullshit free market fundamentalism relies on many nice assumptions - one being that there is plenty of good, high-paying work to go around. The actual fact spelled out in a hundred different ways, from wages to market conditions to books like Bullshit Jobs, is that the economy doesn't need nearly as many workers as we have people particularly in low wage jobs that don't require much training. There is much more supply than demand. Its perfectly possible that if McDonalds paid $1/hr, their competitors would ALSO pay $1/hr. In that situation someone with little skills would have a choice of 1. making $1/hr 2. making $0 and starving. These are the conditions 50-60% of the world works in. We've already seen collusion to keep wages low in technology, not to mention other industries and times in the past, no doubt it happens and can happen again.
As is usual, every time someone points out a bad situation, you say its "not really a free market". So its not, most markets aren't ideal "free markets". Employers can collude, information asymmetries do exist, power imbalances are real. There are literally zero "free markets" in the world. They don't just arise naturally. Even with all the intervention we have, I have yet to see any market where there is no information asymmetry or imbalances. Its a fucking idealized model from Econ 101, not the state of reality.
This kind of thinking is fundamentally un-empirical. It starts with a theory and insists that the world conform to it rather than looking at the world and examining which theory really does explain it best. In this world I would simply refuse to acknowledge the existence of non-spherical objects as a non-spherical boulder rolled down a hill and killed me.