I came to the fediverse in 2017, so nothing to do with reddit or meta or twitter.
The fact is here, we have a choice. So you do you.
On mastodon I have an account on an instance that blocked meta and is using authorised fetch (so the proper way to block a domain) : great, my content won't go there or on any other blocked domains : it's my choice.
I have another account on another instance that didn't blocked meta : great, my content will be shared with threads users and I will be able to browse threads.