I think a better metaphor to gun control is "trying to make physics illegal".

This is because you can ban people from buying guns. But you certainly won't be able to stop people from creating their own weapons. Obviously too little people have the capability, but yes, then can.

With bitcoin is more complicated, because trying to control self-custody is basically trying to ban maths. All you need is an internet connection and some google to find software capable of self-custody. Hell, you can do that with excel if you really want to.

So, as hard as trying to ban math.