“Only technicians who have completed Apple service training and who use Apple genuine parts and tools should replace iPhone displays. These service providers include: Apple, Apple Authorized Service Providers, or Independent Repair Providers using genuine Apple parts. Replacements not performed by Apple, authorized service providers, or certified technicians might not follow proper safety and repair procedures and could result in improper function or issues with display quality or safety.”
So, if you smash your iPhone 11, 11 Pro or 11 Pro Max and get the screen repaired with third party parts, the phone will show you the alert on your lock screen permanently for four days. It won’t stay there but is relegated to the Settings menu for 15 more days before then settling hidden in Settings > General > About.
It comes after Apple said it would block the Battery Health feature on iPhones if you get an unofficial battery replacement. Apple says it does these things to ensure you get the best possible replacements so that your iPhone operates at optimum levels.
The company claims unofficial screens can have issues related to multi-touch and display brightness and colour issues.
It is perceived by some as monopolising, particularly when Apple repairs are usually more expensive that adequate third-party alternatives. It also means that a device you fully own is affected by your decisions on how to fix it further down the line.
Even if Apple is doing it for your own good, these software decisions seem user hostile. In its post it goes on to say that:
“You might see an additional notification that says, "Apple has updated the device information for this iPhone." This means that Apple has updated the device information maintained for your iPhone for service needs, safety analysis, and to improve future products.
“These notifications don’t affect your ability to use your iPhone or your display.”
Despite the latter promise, it implies that Apple has recorded your use of unofficial parts and may permanently note this against the warranty of your phone, though this is unconfirmed at the time of writing.