No, it's just that they want to control what goes into their phones. For instance, I had my Moto G5 screen replaced at a non-offical repair shop here in Poland

No, it's just that they want to control what goes into their phones. For instance, I had my Moto G5 screen replaced at a non-offical repair shop here in Poland. I told them to use the cheapest thing they could find. The screen sucks. It's dimmer than the original, and the camera hole doesn't even align properly. Most importantly, the glass is not at all reinforced, and it already cracked. For me it's fine because I don't treat my phones well anyway and it was bound to happen and I saved money, BUT people that see it will think a Moto G5's screen is dim, prone to scratching, and easy to break. That's what Apple is trying to avoid.