I don’t think I’m missing any point. Have you used it? They’re owned by the same company. Threads is separate but part of Instagram. Other than the user name being reserved on Threads in case the Instagram user wants to sign up, there isn’t an account created. If you try to search the name of any of those accounts in Threads it doesn’t come up at all. (Edit: mistyped a word)
I feel almost helpless against it sometimes.
It’s a well known issue on plenty of popular sites (Facebook/Twitter/reddit/etc.). I’m sure federated sites like Lemmy, Mastodon, and others are just as susceptible to it as well.
I’ve commented on posts in the past to try and combat it and occasionally still do. But there’s a real limit to the amount of stress that comes with trying to convince someone that they’ve been lied to and could be misleading others by repeating what they heard. Especially with the whole “fake news” crap that has been surging I’m the last handful of years. Any proper data used to support truth is just dismissed as fake news.