The brief explanation is that Nitter worked by creating “guest accounts”, which were a leftover from when you used to be able to use the Twitter mobile app without an account. After creation, these accounts lasted for a month. The time since the ability to create these accounts was removed is nearing (has reached?) a month
While I do agree that this is bad, I’m a little confused—what does this have to do with dead internet theory? Doesn’t that relate to users being bots?