While it is time for us to lay it to rest, a new bot will rise in its place and be greater than Tweetbot ever was. Built on an open and free platform, we are proud to introduce Ivory for Mastodon. We have taken everything great about Tweetbot and used it as the starting point for the future of Ivory. We have great plans to make Ivory better than Tweetbot ever could be.

Source: Tweetbot. April 2011 - January 2023

It seems that Elon Musk is doing far more to help Mastodon than to help Twitter.