/r/Piracy owners deserve it. They should've considered such a possibility before allowing their community to grow on a platform they do not control. So they are not "victims", just a bit inconsiderate. And there is no reason to blame reddit, or anyone, for the deletion. They are not obliged to provide their service to anyone.
To wit, you've got a good point about the importance of autonomy and independence. But no one is rushing to defend your position here because you've sprinkled in a few unsympathetic value judgments and absolute claims along the way.