Twitter implemented temporary measures to address privacy concerns and combat data scraping. Access to tweets for logged-out users was restricted, but it has been restored with some limitations.
Twitter login RSS
Elon Musk has announced that there will be a daily limit to how many tweets users can read. The number varies based on the type of account you have. He called it a temporary measure.
Two-factor authentication involves either a text message or the use of a 2FA app that provides users with codes that can help them login securely. However, many users are not receiving the SMS texts.