Exactly. It's very hard to know from the outside where the headcounts are or should be. E.g., Twitter had a ton of ML people. One could argue that was totally u

Exactly. It's very hard to know from the outside where the headcounts are or should be. E.g., Twitter had a ton of ML people. One could argue that was totally unnecessary, because Facebook didn't need that at date X. Or one could argue that they needed more of them, because it's the only way to wrangle the challenges of a large social network, and that hiring an ML person ends up being a net reduction in headcount because of the customer support/moderation people they replace.