By having many more users than the rest of the fediverse combined, basically becoming the default twitter replacement most new users flock to. They'd be taking up all the available "oxygen" as Mastodon withers away and dies.

If just 1/100 of their users who they've automatically given accounts use Threads regularly, there's a big risk of that happening.

[–] [email protected] 7 points 6 months ago

idk if it can, because a lot of ppl who are currently on mastodon, are there because they wanted to get away from platforms like twitter and threads. these users will stay no matter what and would prefer not being able to see the content from threads or whatever other corporate social media might join the fediverse, over switching to those instances.