This isn’t the first time Zuckerberg has espoused the benefit of openness and transparency and how that would create a better society. I get this is a bit different, but the language and sentiment are close enough. Facebook and Instagram are now so closed you cannot view a business page without an account. I think it sold fair to recognize open today does not mean open tomorrow. They want to acquire users and build a platform and that means doing something different than the competition.
'Closed because scraping' is a big problem of hypocrisy
Let's say in a pretend world where Facebook gives a shit about anything (so, they combat marketplace scams, they don't randomly ban users, they faithfully show you posts from friends, they don't extort businesses) they want to protect privacy. So they close the site off, because scraping means there's no privacy. If I scrape your profile and export it to any number of sites, then it's not private. Ergo: closed. Sign up to view things, so we know who you are
But of course in the actual world that's not what they do. They purely want to do this to get more people to sign up so they 'have more users'. You can tell, because of who MZ is. You can tell because of how aggressive their own AI scrapers are on other sites. I've even heard they made a tool for Myspace that would enable you to transfer your contacts over to Facebook - but not the other way around