Why is it Zuck's fault if he lets Sandberg monetize WhatsApp, but it wasn't Acton and Koum's fault for letting Zuck do it? How can it be Facebook's management'

Why is it Zuck's fault if he lets Sandberg monetize WhatsApp, but it wasn't Acton and Koum's fault for letting Zuck do it? How can it be Facebook's management's fault if they let 3rd party apps abuse FB user data, but not WhatsApp managements fault for letting Facebook do the same? Acton and Koum sold out their users for a huge payday, and now they are so rich that they can walk away from a few hundred million dollars to "buy an indulgent" for their immortal souls.