The point of ActivityPub should be to become as widespread as possible so as to proliferate the standard and eliminate silos and walled gardens--including Facebook and its ilk. It would be an unambiguously good thing if Meta's (and Tumblr's) move towards interoperability cascades to the other big platforms like Instagram, YouTube, Twitter, and Reddit.
You could follow (or choose not to follow) users on any platform you want, from any platform you want.
Instagram’s Threads surpasses 100 million users (www.theverge.com)
Edit: TIL it doesn't matter if you make your community on Lemmy or kbin, they're federated and will have equal exposure (kbin.social)
Thanks everyone for the help....
What are we all playing this weekend? (www.rockpapershotgun.com)
Hunt: Showdown, Minecraft, and Dordogne are in our weekend gaming rotation - what are you playing?
Instagram's Threads: 'Almost every influencer will be hopping on it' (www.bbc.co.uk)
Some of the people using Threads on its first day tell the BBC what they think about the app and its future.