1. Yeah. That doesn't make it any less true. If you go so far as to get one that has no Internet connection, an attacker would need have to be super committed (short of social engineering) to gain access, for very little benefit.

2. Services that are intentionally designed to be addictive. That may be easy for you. It isn't for hundreds of millions of other human beings. A dumb-phone precludes the possibility of access, so you don't have to exercise any willpower.