Nitter worked by signing in with special "guest accounts" that I think were given to fresh downloads of the mobile apps.[0] Last year, X fully disabled that functionality, which left most Nitter instances broken. At that point, the developer publicly abandoned/ended the project.
The couple of instances floating around that still work are, to my knowledge, forks of the original Nitter that have been upgraded to work with a pool of manually created X accounts, which is a relatively expensive and fragile approach that most instances probably aren't up for taking.
The couple of instances floating around that still work are, to my knowledge, forks of the original Nitter that have been upgraded to work with a pool of manually created X accounts, which is a relatively expensive and fragile approach that most instances probably aren't up for taking.
[0] https://github.com/zedeus/nitter/issues/983#issuecomment-168...