IMO, Google's profit per employee isn't an indicator of Google's obligation to increase its customer service headcount. Taken to it's logical conclusion, we should let poorly-performing companies off the hook for having awful customer service.
The rest of this comment is going to be somewhat critical of Google criticism and seemingly apologistic. Please assume positive intent.
I agree that Google certainly could do more to help people on its platform. But this will always be the case until every single customer service issue is solved to the user's satisfaction. The important question that I never see anybody asking or answering is "How much is reasonably enough, and how do we know (subject X) has done enough?"
It all boils down to what we believe the moral obligation of people (and companies, by extension) ought to be. Any extra service that Google provides beyond those required for profit maximization (e.g. customer retention, maintaining reputation, being only slightly better than the second-best option) is purely charity. Then, how do we evaluate when a certain amount of charity is sufficient, let alone necessary? Public sentiment is fickle, and therefore not a great measure. I bet even if Google increased its CSR by 10x, we'd still see communities eagerly latch onto any criticism of the tech giant and shout "you have to do more!" without quantifying what the final demand actually is!
I take the moral position that we as a society certainly can and should do much more to take care of each other. Telling each other to be better is absolutely valuable and I will never argue against that. But I believe we ought to do a much better job of suggesting desirable and realistic end states, instead of perpetuating insubstantial discourse amounting to one of either "They need to do better!" or "Come on, they're doing the best they can."
Admittedly this places me in a non-committal position. I don't have any great suggestions for what the end states of YouTube, Twitter, et al should look like from a content moderation perspective. But I would love to hear input from actual experts in who can offer some reasonable ideas about the most cost-beneficial solutions for society as a whole.