I don't see, how such policies can possibly achieve more good, then harm.

A person, who posts slop for whatever reason, or runs bots that post slop, will simply ignore them.

An honest person, who cares about the quality of their contribution and genuinely wants to improve the project will be more limited in the choice of tools to do so.

So, this policy only serves to limit honest contributors, while doing absolutely nothing to stop spammers/slopposters.