I thought the MC was supposed to be intelligent. It's almost immediately obvious that the man controlling his mother in WifeSpy is his brother. You know that the first time you check the hypno message content. It's later confirmed by the fact that the brother gets him out of the way so he can't spy on their mother, and further evidenced by the fact that the jerk wears a mask when he is with their mother. It's also exactly the kind of asshole thing Mark would do.
You have way too high hopes for the MC's intelligence, he doesn't even get that his wife is being fucked infront of him while her phone is ringing and he is trying to call her.
And there are even more situations like that, like "nah, can't be my wife, she would have told me, we agreed to tell us everything, it's just my imagination".
It's quite clear she received an app command from the WifeSpy-device to keep it secret from the MC because they like to see him suffer. So he tries to push harder so they can make him reach a point of no return so the devs can reach out to the MC to offer (meaningless) help and advices.
You can be quite sure about that the MC's brother got his hands on the app through the app-devs and might already be manipulated by them into screwing up the MC's life some more by currupting their mother.
edit: The branch has also some inconsistensies. At first the devs tell the MC they can't provide him with an additional slot, and he can't remove already added targets from his app to add his mother, but later on they encourage him to go find out who has added his mother to remove her from the person that is currently controlling her to add her to his own app.