I have maintained for a very long time that nothing is immoral which does not involve a violation of property rights. I have never had anyone satisfactorily refute that assertion.
All price controls, as well as being economically ignorant and misguided, are immoral.
To force a person to sell their product or service for less than they would voluntarily is immoral.
It violates their right to control their property as they see fit.
This is the reason why governments everywhere, even the more benign of them, are immoral agencies and are not deserving of our support or homage.