Apple definitely looks out of their own interests, but they jump through a lot of hoops to protect their customers from bad experiences, especially since the obvious implementation was to just disable the fingerprint sensor if can't be trusted.
Edit: additional info from the TC article: <<The update is not for users who update their iPhones over the air (OTA) via iCloud. If you update your phone that way, you should never have encountered Error 53 in the first place.>> Your conspiracy theory would really require that they brick phones through both the OTA and iTunes update.