Freedom is the right to do whatever you want. Power is the right to force others to do what you want. Thus power is restricting others freedoms.
Copyleft gives you freedom but no power.
Permissive licenses give you freedom *and* power, allowing you to restrict the freedoms of others.
That’s why powerful people (and those dreaming of being powerful) don’t like copyleft. When you are accustomed to the privilege of power, freedom of others sounds like oppression.