Bear in mind that this blocks you from seeing Threads posts on your profile. Unless you private your profile, this changes nothing as far as what they’re able to see/pull from your account. Their official documentation states that the block only prevents users from seeing or retrieving content from those servers. You’d probably have to be performing some DNS-level filtering on incoming requests or web firewalling from the host level to prevent their incoming requests.
Can’t you get banned from Threads? What happens when someone posts content on a Fediverse server that isn’t supposed to be allowed on Threads? Porn, for example.
I assume so, yeah. That pins on Meta’s moderation doing its job. I’m talking the other direction, though - Threads/Meta scraping your data from your Mastodon account.