They’re not creating a shadow account, you’re literally logging in with your instagram account.
What this post is implying, is that the user numbers are just existing instagram accounts, which doesn’t make sense because in that case they’d have 2 billion users within the first second.
You can follow/request to follow before the user has actually “created” the account, so they’re lying about which users have done that already, not about how many users they actually have.
Come at me downvotes
How is Ivory not on that list?