It's not just the cost of the OS. Orders of magnitude more costly is developing and maintaining the apps. That includes 1st party apps from Google and Apple and 3rd party.
The problem goes deeper than that. I've have discussion with highly educated people in San Fransisco and it becomes obvious they really don't understand this is basic supply and demand problem. The first step in fixing this is somehow teaching econ 101 as a PSA.
It is annoying, but it also reflects Zuckerbeg's mindset pretty well. What has changed since that quote is that he has learned to mask that mindset and lie and deflect.