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Meta’s new Threads app is closely linked to Instagram, so much so that you can’t delete your Threads profile without deleting your Instagram account.
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This is mentioned clearly in Meta’s supplemental privacy policy, which many new Threads users failed to read in full.
Threads is basically a new feature of Instagram, they don’t even talk about it as something that is distinct from it.
Technically Meta already had everything ready for a Twitter functionality. Doesn’t make sense to copy it. Just put together a little differently.