Elon Musk's X has won a court order blocking a rival project, Operation Bluebird, from launching a new app under the "Twitter" name, after a US judge ruled X had not fully abandoned the trademark. Chief Judge Colm Connolly found that X still benefits from the Twitter name commercially, notably through its App Store listing, which begins "Welcome to X (formerly known as Twitter)" — a clause X's legal director said was deliberately added to help former Twitter users find the app. This makes it likely X will succeed on trademark infringement and dilution claims, so the court blocked Operation Bluebird from using the name while litigation continues.

However, X fared worse in defending its rights to the word "tweet" and the bird logo, which the judge found it had likely abandoned. Musk's own public statements about bidding "adieu to the Twitter brand" and cutting the logo off buildings "with blow torches" were cited as evidence of clear intent to discontinue those marks. X pointed to a dozen old webpages, dormant social media accounts and a legacy app still installed on some devices as evidence of continued use, but Connolly dismissed these as mere "remnants" of prior use rather than active, deliberate branding.