To make it even less likely that someone will be able to get it unscrewed without having the right set.
They’re not perfect, obviously, but they do harden a target more than regular Torx.
I use tamper resistant screws to keep an AirTag on my eBike to discourage its removal. Obviously a determined thief could remove it, but lots of stolen bikes get abandoned anyway. My hope is that if it gets stolen it gets abandoned and I can find it then.