I think that any shared account is technically a violation of the rule, but OTM probably overlooks clan bank toons because there isn't a built-in clan bank feature yet.Actually i have a question on this topic if you dont mind if anyone had access to a clan bank and they did not create the acct but they duel log to transfer items in and out im sure this is done by many players in almost all clans is this a not a violation of the rule just curious?
OTM mostly only enforces the rule on accounts that have been sold for in-game/real money. Forcing people to start fresh means more elixir and sigil sales for OTM. Clan banks are for holding raid loot, not leveling, so they don't care.