Why do morons like you keep saying this?
It's like people who say fat people should "just lose weight" or gamblers should "just stop gambling". It overtly paints you as willfully ignorant at best.
Impulse control-related disorders have been in the DSM-5 since 2013, and recognised widely long before that. Do you just not believe in impulse control disorders at all? Do you tell people with cancer to just not get cancer? It's ironic that you bring up the example of a child, since children are definitionally lacking in impulse control.
This game and others like it prey on people with reduced capacity to control impulsive behavior, in many different ways. Do you honestly believe that Blizzard should have the unfettered ability to target people's self-destructive impulsivity when the outcome is that they ruin their life?
It isn't Blizzard's fault that people have impulse control disorders, but it absolutely is their fault that every aspect of their design is overtly aimed at exploiting them.