Using Nitter was how I’ve been privately browsing Twitter. It looks like Twitter has blocked all unregistered users from viewing any content.

People are being corralled on the path to making everyone a blue check. nostr:npub1qny3tkh0acurzla8x3zy4nhrjz5zd8l9sy9jys09umwng00manysew95gx has been warning the nudges will increase to get everyone registered and KYC’d.

https://www.theverge.com/2023/6/30/23779764/twitter-blocks-unregistered-users-account-tweets