True. Even though "this" is not an actor (but the `ChannelRegistryImpl`) it is created and held by an Actor (the `SelectionHandler`). So, *if* the selection were allowed to be restarted there'd be a potential leak.
However, the SelectionHandler cannot be restarted (is has a stopping supervisor strategy) and the only ones receiving a registration are its children, which are always going to be terminated before the SelectionHandler instance is terminated.
Therefore we will never see this potential leak occur.