I am probably among the very rare ones who had a reverse migration. I had never cared for microblogging social networks before and was fine with just a few anonymous reddit and instagram accounts, but during the acquisition there was so much hullaballoo over it that I decided to give Mastodon a shot. It was, and remains, hilariously inept at content quantity, quality and discovery no matter how many accounts you follow. Then I checked out Twitter (for the first time), and was pleasantly surprised at the relative difference in the quality of discussions and engagement being fed into my home feed.

My initial follows were just a bunch of popular professionals and educators in the AI industry but the algorithm expanded to inferred interests of science, sci-fi, business and cyb-sec and managed to keep me hooked on it more than even Reddit (where the quality of posts broadly everywhere have crashed catastrophically). I don't know if this existed before or that they have done something after it transitioned to X - but it's working. There has been a monumental growth in traffic on X despite all the exodus.