You've heard some other responses, but also consider that the abused person still often feels like it isn't that bad, and that the abuser doesn't really mean it

You've heard some other responses, but also consider that the abused person still often feels like it isn't that bad, and that the abuser doesn't really mean it, etc etc (usually the result of psychological abuse). In this scenario, it's easy for the alert part of the brain to say "let's just download this app and set it up, just for the heck of it, even though I don't really need it," and it won't feel like the same kind of commitment that is needed to actually leave the relationship, or get a restraining order etc. Or, similarly, a concerned friend could say "I know you say he'll never take away your phone, but let's just set this up, for the heck of it." Again, the victim may agree, with the one part of their mind knowing it's the right thing to do, and providing plausible deniability for the other part of their mind.