This is no way an effort to defend him, I know nothing about him and the devs say he was a douche who tried to break rules thats fine enough reason to ban him IMO.
But when it comes to account sharing, who is hurt if trusted guildies or trusted friends who want to try something new decide to swap accounts to get more enjoyment out of the game. Objectively, noone is, and only positive things come out of it if done responsibly. If a person account shares and is robbed, its on them ofcourse, and I think they will have to deal with having all their invader sold for gold and stuff emptied if they share too liberally LOL.
I would like to offer an antidote to support this:
Back towards the end of the original warhammer on Badlands, I had a rr93 DoK that I played sense the 3 day headstart and was one of the strongest players in the game on it(I also ran the best destro SC premades for at various times



We all have different experiences threw-ought life that leads to our different opinions, and the only time I had participated in account sharing was really incredible for everyone involved.
So, if someone is willing to take responsibility for of being robbed and account shares, why not let people do it with people they trust? If looked at rationally, I cant fathom a downside and only upsides if done responsibly