Here's what I suspect ,you will most probably generate a fake bill of warranty or some insurance from a third company bullcrap on which the Iphone will screen will be replaced by a small amount,the rest will be paid by the insurance company that doesn't exist.I don't know how accurate is that but something similar is expected from your method.
If that's the case, it would most definitely make this very illegal.
No, that's absolutely not what I do. This is very easy and legal, I speak to Apple and only Apple regarding your iPhone
Screen replacement. Again I'm not gonna give the details but you have nothing to worry about
I wouldn't be doing something wrong and risk other people getting in trouble for it.