This post seems to be haphazardly proposing that big tech will inevitably make everyone's lives miserable. And by working for them, you are enabling this. It offers no constructive alternative and the author (yes, I know who he is) seems to have no issue with Google hosting their email. It's hard to take this too seriously (even if there is some legitimate worry here)
From my experience, the problem I saw, and why I really respect OPs post, is that many good and smart people were lying to themselves in those environments. They'd do exactly what you do and try find reasons to justify working in tech.
Go into your average modern tech engineering team at e.g. Amazon, and ask them how many of the engineers in there use and support the software they're creating. They tiny fraction of people who say they do use it and support it, go check their usage, and you'll see half of them were overinflating it. HN knows it better than anywhere: many of these tech companies are not producing great tech to improve people's lives.
To you point "no constructive alternative" - think about it this way, if you're spending your life writing something you won't even use for reason that boil down to "it's just not valuable for me, especially knowing how its made", then doing literally anything other than working there is a more valuable use of _your_ time for you.
Look at your household and figure out what you need and what would improve your lives. If it's "6 figures salary and a world owned by megacorps", then working in places like Amazon is the best thing you can do for your family.
If you're a small household without kids, like a lot of people in these engineering environments, then instead of spending 12 hours a day mon - fri addicted to trying to solve this really cool little engineering problem (which just so happens to help e.g Amazon), you'd be far better solving some really cool little engineering problem that just so happens to help your family, like building some cool home automation thing for them, or working on your own house to make it more efficient so you can use less energy so anyone else working in your house can retire earlier with smaller outgoings. Or even just being a housewife/husband will improve the lives of the people you care about in more valuable and appreciated ways than anything you could do working at Amazon.
Now, I appreciate I'm in a lucky place to be able to do this, but if you've been able to work as an engineer in top engineering environments and this post is relevant to you, then you are already more than lucky enough to be able to walk away from those environments do things that are consciously useful and appreciated by other humans whom you value.