WaPo article: https://archive.is/wip/sgViP
Company owner Elon Musk tweeted that the change was a “temporary emergency measure” to deter third-party scraping of data from the social media platform. “We were getting data pillaged so much that it was degrading service for normal users!” Musk wrote.
User "elonmusk" not found
Quote: "Doing it hours before the end of the month after Musk has had a history of not paying contractors/suppliers screams that a major host for twitter is shutting them off at the start of July and "oh shit we have to turn stuff off or we'll not be able to keep the site up""
https://github.com/zedeus/nitter/issues/919#issuecomment-1615881365 (https://archive.is/RN3mr)
There are also claims that web Twitter and the iOS app has also stopped working, despite the website being accessible (but only if you allow cookies).