https://techcrunch.com/2023/07/05/twitter-silently-removes-login-requirement-for-viewing-tweets/

Days after requiring users to log in to view tweets, Twitter has silently removed these restrictions. This means you can open Twitter links in a browser without an account.

We at TechCrunch noticed that tweet previews are unfurling in Slack and WhatsApp. Folks at Engadget noted that Twitter previews were visible on iMessage as well.