I’m disappointed that governments’ ability to reign-in misbehaving companies is predicated on them having a de-jure monopoly, as though its like magic enchantme

I’m disappointed that governments’ ability to reign-in misbehaving companies is predicated on them having a de-jure monopoly, as though its like magic enchantment: “naa-naa! You can’t touch me! I’m not declared a monopoly!”. I don’t see monopolies themselves as being particularly special, I think laws to restrain the holders of captive-audiences in general would be more useful and serve the public good.