Verbatim: it wouldn't scale.
Acton said he tried to push Facebook towards an alternative, less privacy hostile business model for WhatsApp — suggesting a metered-user model such as by charging a tenth of a penny after a certain large number of free messages were used up.
But that “very simple business” idea was rejected outright by Facebook COO Sheryl Sandberg, who he said told him “it won’t scale”.
“I called her out one time,” Acton also told Forbes. “I was like, ‘No, you don’t mean that it won’t scale. You mean it won’t make as much money as…,’ and she kind of hemmed and hawed a little.
It looks like to me that the multi-billion dollar company that Facebook is, with all the very intelligent people working there, is a one pony trick that only knows how to make money by putting ads everywhere.