I don’t see the big deal with this...18-25 yr old males registering for the draft has been mandatory for decades now. I had to do it back in 1982, and I was already in the USMC by that point. All this means is that you don’t have to fill out a form and send it in anymore, its automatic once you turn 18.
Not mandatory.
Were you automatically signed up, or, did you comply, and, send in that form, on your own volition?