Twitter was famous known for having a bird as it’s icon, and referring to tweets as their messages. When Elon Musk bought Twitter, and renamed it to X, an upstart company named Bluebird came along and said “we want the name and logo”. The claim was that X wasn’t using any of it, so someone else could, and oddly enough, they gained some ground in court this past week. X retained the Twitter portion, as they still use that in their “formerly known as Twitter” taglines, but somehow the term tweet and the bird logo went to Bluebird. Bluebird is still in early stages, stumbling as they now lose twitter.now, and have moved to tweet.app for their own short message app. Only time will tell if they succeed, as they are charging $20 or more for usage… and only have 170,000 signups, a drop in the bucket compared to X’s 557 million monthly active users.

X’s continued need of “formerly Twitter” just won it a preliminary injunction.
Source: Judge Lets Musk Keep ‘Twitter’ for Now but Forces Him to Release the Bird – CNET