It’s probably even more simple than that - a single DB with a flag for threads_enabled = true/false.

They made it super clear in advance this is how it would work, the app is called “Threads, an Instagram app”, but as always people froth at the mouth for any opportunity to say “Zuckerberg bad”.

That’s not some big secret. Everyone knows meta sucks. We don’t need to make stuff up to prove that. They do that on their own.