I don't think Mastodon is as resistant to enshittification as everyone seems to think. Or rather, I think the drivers towards enshittification still exist - primarily, economic pressures relating to operational costs, and the human cost of managing communities - but because there is no actual revenue stream that can even potentially be gained from enshittification and the users won't tolerate anything that might amount to it, what winds up instead happening is that instances just close when their admins either run out of money or burn out. The service on instance X doesn't get "enshittified", it just ends.