Isn't it relatively trivial to remove one of these by epoxying something to it or using a drill or dremel to modify it in some way (e.g. dremel a slot that a standard flathead can turn, or drill and use a screw remover)?
Or is the purpose less to prevent people from removing the screw and more tamper evidence?
Even in that case, with a photo or impression of the screw head, an unauthorized key/bit could be produced with with 3D printing (JLC3DP offers it cheap) or EDM.
The button head is designed to be low profile and is rounded off enough to prevent tools from getting a good bite into it to cut a slot; on top of that they’ve designed these fasteners to torque super tight down (including ‘claw-like’ serrations on the bottom of the screwhwead) to basically require their tool so the bit doesn’t snap off if you try to make a duplicate.
If its on the wheel hub you’re going to need more than a dremel to do that, and you’re going to need something that breaks less than a flat head. There’s a reason they don’t make flat heads for impact drivers.
Or is the purpose less to prevent people from removing the screw and more tamper evidence?
Even in that case, with a photo or impression of the screw head, an unauthorized key/bit could be produced with with 3D printing (JLC3DP offers it cheap) or EDM.