So in the last month of being a new Mastodon admin I've seen: (1) a popular instance wipe its entire database and (2) a popular instance's operator ragequit and take the server with them.
Definitely an education in mastodon failure modes!
My sense is that the decision to become a Mastodon admin comes with some responsibility to plan for continuity... the broader Mastodon community suffers when there is no plan or a lack of effort to carry it out.