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
He made a thread on 4chan about it last night. It was unmistakably him. His tweets and twitters actions afterward match up https://archive.4plebs.org/pol/thread/432782493/#432782493