https://www.vice.com/en_us/article/bvjvb5/threads-instagram-trap-shows-why-facebook-should-have-been-broken-up-years-ago

Threads, Meta’s Twitter rival, launched on Wednesday and people are already trying to deactivate their accounts. The issue is: you can’t deactivate your Threads account unless you delete your Instagram account too. 

“You may deactivate your Threads profile at any time, but your Threads profile can only be deleted by deleting your Instagram account,” the Threads Supplemental Privacy Policy reads.