GDP per capita is a poor measure of productivity, and doesn't consider externalities.
SF is pretty good at producing emotionally manipulative adtech to opt every Internet and smartphone user into a global panopticon, and also quite prolific at social media that turns our lives into perpetually distracting hedonic treadmills.
Time will tell whether the "productivity" of SF was a net benefit to Civilization.
But there's plenty of space there already: upwards. It's just illegal to use.