https://arstechnica.com/tech-policy/2023/01/reports-twitters-third-party-client-lockout-is-intentional/

Twitter has not yet explained why third-party clients like Twitterific and Tweetbot stopped working late last week. But a new report and testing by one app developer suggest the outages and lack of communication are intentional.

Internal Twitter Slack chat messages viewed by The Information (subscription required) show a senior software engineer writing in a "command center" channel that "third-party app suspensions are intentional." Another employee, asking about talking points to use when addressing the outages with product partners, was told by a product marketing manager that Twitter had "started to work on comms," but there was no delivery date, according to The Information's report.