The median of its employees’ geographies is China. That’s how it got worse than your average maturing Bay Area company
cheap programmers, long 996 hours, and access to the biggest market in the world.
I mean, this was true when I joined in 2013. One guy I worked with was the only non-Chinese person working with the targeting team. So I really don't think it can be reduced to such a simple explanation.
To be honest, Facebook acquired lots more US business culture, and that's (personally) where I think lots of the rot came from.