Lol, I think their plan is to still federate with Mastodon specifically to pad out their vapid platform with content. They were just too much of a self imposed rush to capitalize on Musk and his stupidity, to do it before launch.
Facebook doesn't care about the tiny amount of content on Mastodon. And it's the wrong type of content anyway. Mastodon is for misfits, nerds, anarchists, Tumblr-style far-left politics, doomers, weirdos and very bad artists.
Instagram and Threads couldn't be more different. It's commerce. Beautiful people. Beautiful places. Shopping. Mainstream pop idols. Grifting influencers. Celebrity gossip. Lifestyle. Fashion. Interior design.
Facebook prefers the latter group as this is where advertisers thrive. The typical Mastodon user would have an anxiety attack when they see an ad.
