I was oversimplifying, but I stand by my words. It does optimize for profit, just with extra steps. For most FB ads products (that you see in feed), advertiser

I was oversimplifying, but I stand by my words. It does optimize for profit, just with extra steps. For most FB ads products (that you see in feed), advertisers pay based on conversions (views, clicks, likes, joins, purchases, etc.). So revenue is directly tied to conversions. Then there are extra steps weighing in revenue != profit, advertiser retention, repetitiveness, long term user value, etc.