"Side loading" is only for beta testing applications with one's customers.
"Side loading" is not an official distribution method.
So if side loading is one's distribution method, then Apple will shut you down - including suspending your developer license.
Obviously, using private APIs is FORBIDDEN to developers. Apple is very up front about this.
So a developer who flaunts this will be shut down.
Is there anything about "no" do these developers not understand?