I feel a bit for Brian Acton - iirc he refused to sell because the 500M users paying $500M dollars was more than enough to fund his tiny team (of 30?), but when the offer went up to 19B$ it's just kind of hard to turn down - there's extreme opportunity cost there. Most people would sell before that, 19B$ of principle is quite a lot.

I think it's just if you're empire building - and Zuck is insanely good at this, one of the best - then it'll never be optimal to charge vs. grow massively and then monetize the larger attention base.

Zuck is also in a trench warfare competition with other social media players, it's far from a monopoly. He's historically been more inclined to do things that were worse for growth, but better for users when they had more of a dominant position - but he can't do that anymore.

Somewhat relatedly Apple really missed an opportunity with iMessage. Had they timed it right they could have had a dominant cross platform chat. Instead they're going to be stuck with the modern equivalent of BBM while Zuck and Meta erase their only remaining stronghold in the US as iPhone users continue to move to WhatsApp.