The new standalone app will be based on Instagram and integrate with ActivityPub, the decentralized social media protocol. That will theoretically allow users of the new app to take their accounts and followers with them to other apps that support ActivityPub, including Mastodon.

The article doesn't say it'll work the other way too. Is that the author's lack of knowledge, something from Facebook's press release, or is Facebook basically gonna do an Embrace Extend Extinguish sort of underhanded thing to capture the enire ActivityPub ecosystem?