> but what exactly is being lost by moving the repository to GitHub?
Contributors who can't use GitHub because either 1) they are fresh and can't activate a new account 2) their old grandfathered account is no longer usable or 3) their old account id doxxed and they can no longer safely contribute under the old identity.
Once you trigger phone-number verification requirement your account is globally shadowbanned and support blocked pending SMS code verification. Aside from the privacy issue it's completely blocking people in countries to which GitHub won't even try to SMS/call.
Remember that registering a second account would be violating GitHub ToS.
Contributors who can't use GitHub because either 1) they are fresh and can't activate a new account 2) their old grandfathered account is no longer usable or 3) their old account id doxxed and they can no longer safely contribute under the old identity.
Once you trigger phone-number verification requirement your account is globally shadowbanned and support blocked pending SMS code verification. Aside from the privacy issue it's completely blocking people in countries to which GitHub won't even try to SMS/call.
Remember that registering a second account would be violating GitHub ToS.