I mean, suppose they offered a 100% automated health clinic that misdiagnosed and killed 10% of the patients: "We'd like to hire actual doctors, but that would cost more than we'd wanted to spend, so there's literally nothing we can do to fix this problem. Sorry!" That wouldn't fly. Well, neither does this. Facebook today absolutely sucks at advertising. They're good at the cashing the checks part of the process, but horrendous at the actual implementation.
[1] 27.26% margin, according to https://www.macrotrends.net/stocks/charts/FB/facebook/profit...