Yeah, I'm guessing there were humanoid robots used on battlefields and others used as assassins/sleeper agents/terrorists by pretending to be, say, children.
Which would absolutely lead to people banning the further production of said robots.
Wait why does Ponko have a photon cannon too? Ponko’s older sister is so cool and I love her. Taro is also a cool robot and I loved the little end card where the older sister sent him a postcard with Ponko labelled as little sister