Amazon at least provides useful services. They do it on the backs of underpaid and poorly treated warehouse workers, but Prime shipping is sweet! Treatment of those interested in unionizing is about the biggest indicator of a company's values, and Amazon is quite clear on that point.
My main point overall is why work for a company like that when there are others doing the good things FAANG companies pretend to be providing?
It's not a black-and-white choice between "goodness of their hearts" or ruthlessly exploitative capitalism. There's a huge gray area in between, and that's where social and legal guardrails (for better or for worse) have to help ensure that companies act in a socially responsible way.
I don't have experience with Facebook specifically, but I have worked with Google's security team. From what I've seen, Google truly cares about securing their users' data in a way that exceeds the standards of other large enterprises that I've worked with. I get a ton of spam emails and phone calls every day, and never once have I suspected that it was because Google or Facebook violated my privacy.
I'd rather focus my ire on companies like Equifax or popular browser plugin acquirers or the debt collection system or even mall sweepstakes. All of these entities egregiously violate privacy by blatantly sharing user information, auctioning it off to the highest bidder, or recklessly failing to secure it.
So much of the Internet as we know it is built atop AWS. Many people are able to shelter in place with minimal impact largely because of the groundwork laid by Amazon, during more than a decade of not being profitable. That includes ordering equipment to work from home, ordering home goods to avoid going out, running the compute infrastructure that powers teleconferencing tools like Zoom, providing entertainment options through Prime Video, etc. etc.
How many families are staying in touch through Facebook Messenger, video chats, and just plain old photos? How many grandparents feel less alone because they can see their family members and a wealth of photos every day? How many old friends reconnect because Facebook exists?
Google makes the world better in so many ways that I can't even pretend to address it exhaustively. I personally have been able to experience remote places thanks to Flights, Translate, and Maps. I use Search hundreds of times a week... the world's knowledge is more accessible than ever before thanks in part to Google's efforts to organize it.
I think it's totally right to call out companies where their behavior is poor. I think we need to demand—both through social pressure and through laws—that companies respect privacy, treat workers well, and minimally impact the environment. But I think it's taking it a step too far to claim that the world is worse off for the effort of FAANG employees. Even those working on ads... if there's no ad revenue, none of those other benefits exist.