"An open source project that let people view tweets without going to Twitter.com has shut down, as Elon Musk’s changes seem to have closed off all possible ways to access the Twitter network without a user account.
Nitter provided an alternative front-end to Twitter but has been struggling for months. Nitter.net, the official Nitter instance, went down a few weeks ago."
RIP Nitterbot
The method of access they use is fundamentally broken now, because there’s no way to get new guest account tokens. So the remaining instances will die out one-by-one as their tokens expire, since there is now no way to renew them.