I spent 5 years at Facebook (2013-18), and I can guarantee you that if you fired the sales teams, revenue would take a pretty large hit.
More generally my friend who was there till last year (at a pretty senior manager level) said that once the AAP thing happened with Apple, it got really really nasty.
Like, every company tends towards the median of it's geographies over time but Facebook was a pretty special place to work at back in the day, and it looks like a lot of that has been lost now.