lemmy.ml is still up as of right now. Possibly they contracted a subscription to the domain name to keep it up. They had to do something to retain it otherwise the site would be unreachable. If lemmy.ml does have to change names it will be a hassle since I've got a good number of community subscriptions there.

This wouldn't happen to an instance with a regularly subscribed domain name. Problem is the .ml domains were free and the associated country decided to claim them back. The risk of using a free top level domain is something that should have been considered. I don't think it's worth the risk versus the cost savings considering how difficult it is to migrate a Lemmy instance.