I think within these conversations FAANG is just a term to stand-in for those type of companies and not just the 5 listed ones. Maybe FAANG+ would be more explicit and clearer?
I've worked for companies who are FAANG+ and I would say I can't see any logic in being against FAANG+ companies that doesn't require individual examination of each. Saying you don't want to work for FAANG+ would probably mean you don't want to work for any for-profit corporation or any corporation in the tech industry.