Right, because building something online eventually changes the dynamic. Just pick a big "Community" and do some digging - YouTube Comment Section - Reddit - 4Chan - Twitter. There's not a single online community that is inherently positive or constructive without extensive, heavy-handed moderation.
If you get to the end, you'll see that Zuckerberg thinks that Facebook can AI moderate away shitty behavior. Look closely, that's a fundamental claim. Yet, at the end of the day, he's running a business, not a Non-Profit Human Welfare Organization, right?