@josh One thing that I think lowers my level of concern here is just how gosh-darn easy it is to move one's account (and follows/followers) elsewhere. Sure, it doesn't help in an "immediate shutdown" situation, but the friction involved in moving Mastodon hosts seems like it is an order of magnitude lower than for email or web. And that is awesome, IMHO, because I think it will allow for very rapid experimentation + evolution.