Morality and ethicality has nothing whatsoever to do with legal or illegal. Legality is a concept obtruded to people by a minority, elected by a miseducated and misled majority. What OP meant was obviously the spirit of sharing as opposed to profit at all costs. And the answer lies in itself, the spirit of sharing includes sharing (hence the name) and not only leeching, that’s what private trackers try to assure the users do.