Dehumanization isn't just the tech industry. It isn't even
just industry. Our philosophy has dehumanized us.
Yes, the tech industry can be dehumanizing. (So can technology.) Yes, industry can be dehumanizing, as they try to wring every last cent out of you without concern for what it does to you as a human. But I think the problem runs deeper than that. It's basically a question of who we think we are.
As a society, we no longer believe in God. We believe in the physical universe - in matter and the laws of physics. That means that all we can be is matter that obeys the laws of physics. That's all we can be, because there is nothing else.
In particular, we can't have any free will or any ability to make a real choice. Matter that obeys the laws of physics doesn't choose anything - it just obeys the laws of physics. We're just machines made of atoms obeying the laws of quantm electrodynamics, which make up biochemicals obeying the laws of biochemistry, which make up neurons obeying the laws of neurology - and nothing more.
We can't love in the real sense of the word - choosing what's best for the one we love - because we can't choose anything. Even the lesser flavors of love are just a matter of biochemicals and neurons just doing their thing.
There's no real beauty in any objective sense - there's just certain things happen to hit our neurons in a certain way.
For that matter, there's no truth, either, and not just in the postmodern sense. If our brains were built by evolution, they were built to give a good enough answer fast enough. They were not built to find actual truth, even were such a thing to exist.
So in this view, free will, love, beauty, and truth - everything we thought of as making us human - are dead. We're just machines, just like the computers on our desks. As more and more people believe this (and start to act like it), it becomes more and more rare to be treated in a genuinely human way.