It doesn’t need to take down reddit. I’d like to see Lemmy at 1 million active users though. Just need enough critical mass to be able to branch into more smaller sublemmys which draws in the fans of those subs specifically and creates better curated content.
Threads was because if you had an Instagram account it ported over.
Bluesky was the Twitter clone made by the old Twitter CEO.
Most people didn’t have a problem with Twitter being a corporation, they had a problem with the new owner of the corporation making the experience terrible with his new changes.