While I'm glad that Cydia exists, for those individuals who love iOS and i-things but wish to step outside of apple's total control, it seems less professional to me to release an app whose usage specifically requires 100% of the users to violate the agreements they made with the manufacturer.
Not if that agreement is taking away their rights. Violating such agreement (or assuming users violated it) shouldn't be viewed as unprofessional. Not any more unprofessional at least than expecting Applet to violate users' rights when Apple make such agreement.
While I'm glad that Cydia exists, for those individuals who love iOS and i-things but wish to step outside of apple's total control, it seems less professional to me to release an app whose usage specifically requires 100% of the users to violate the agreements they made with the manufacturer.