I received an email today from Slack referring to a complaint from a customer that had been impersonated by someone on their team. While I do think that the cloning feature is great for a laugh it can clearly be taken too far (and did technically violate the Slack ToS). As such, the cloning feature has been removed and all OAuth tokens have been revoked (meaning you'll have to sign back in).
The custom character feature is still there though so cough who knows what cough people can still use that for... cough
If I just made your day a little better then thank me with a coffee: