I happened to have worked at Apple, Facebook and Google. I’ve found all the people there to be generally pretty morale people who try to positively influence decisions. Sometimes it’s a losing battle and decisions get made that you disagree with. However that’s broadly true of any group of people so saying all members of a group are morally compromised seems unhelpful. You could say the same about anyone working on the government or any business or even generally associating with people.

I disagree with the position taken that you can evaluate a person’s principles solely by their choice of employment or association. It’s only one factor and usually an unhelpfully reductive way to look at the world IMO.