I would like to add that on mobile, Twitter is already walled off. It detects your scrolling and blocks further viewing beyond the initial tweet that brought you to their site.

Nitter works great as  a thread reader.  The entire thread appears on one page.  

Plus, when using a browser and not logged into Twitter, eventually (e.g., within a page of Tweets) it will require login/auth in order to continue viewing Tweets.   Nitter doesn't have that behavior.

And, personally, I wish to deny Twitter the ability to collect data on me -- which they may do even without me being logged in to a Twitter account.   Since it is the Nitter server that is accessing Twitter, and not me that is doing that, Twitter has no knowledge of which IP address / edge device is accessing the content.