Sorry, are you actually five years old? Until just a few years ago Twitter was entirely open. You could view any and all public tweets, replies, threads. All exactly like you were logged in. Their APIs were open and you could literally plug the entire stream of all tweets from all users on the actual planet in real time into your own application.

Come on, pre-Elon you could click on a Twitter link and read the entire thread as well as the replies, now you just get a single tweet with no context above/below.

And if you click on an account you just get top posts of all time instead of a chronological feed, so it's impossible to even find the context while being logged off.