it’d have to be someone experienced with moderating sizable subs, probably

So someone who was using moderation tools provided by 3rd party apps?

They also said they won’t force subs to reopen

Reddit migration will succeed for some communities and fail for others. Generic subs can live on with new mods and new subscribers. They’re not much different from FB or Twitter. Just mindless content to feed that infinite scroll.

Specialized subs where the community as a whole (or a majority at least) decides to move to a new home will move (or have moved already), because for those the community is what matters, not the venue.