I think it's stupid to judge someone for working at Oracle or Facebook. It's cliquey and smacks of resentment. I'm also bothered by the moral certainty implied. I don't work for a "problematic employer" but I have no idea if my work is making the world better or worse and I suppose it's hard to tell.
They cast the world as a worse place that it actually is, and in the process make everybody a reading their rant just a little less happy and content. But the virtue signaller gets that sweet, sweet attention they crave without actually having to produce or earn anything.
Non-profits are not inherently good, either.
Don’t pretend you are trying to save the world when you just want a good living. It’s fine to just want a good living!
There's no moral high ground to be had when you are working for the proverbial elephant in a space. You have to decide if your individual impact creates more good than whatever harm your contribution enables whenever the elephant thoughtlessly steps on someone (or we could try to build a future where no group has enough power to cause that kind of harm, but that's a different subject).