Because the implication when you set up a recovery account is that it will only be used for recovering your account. It never says anything like "do you want to link these accounts". It is totally implied that you could use a friend's account for example and banning them for something you did is insane.
Yeah, it is a insane practice. I never declined that.
But it is apparently also quite insane to rely so much on one company and especially when that company avoids human support.