Those "bootleg" screens often are genuine, but Apple makes features not work unless paired. You can literally swap the screens of two fresh out of the box iPhones and they won't work. Swap them back, they work fine. Don't defend their practices, and don't believe the lies about repair they've been feeding you for years.
You know what's funny? It's not the independent repair shops stealing your data, it's the "official" ones. https://www.theverge.com/2021/6/7/22522560/apple-repair-multimillion-iphone-nude-photos-privacy-settlement-pegatron
Those "bootleg" screens often are genuine, but Apple makes features not work unless paired. You can literally swap the screens of two fresh out of the box iPhones and they won't work. Swap them back, they work fine. Don't defend their practices, and don't believe the lies about repair they've been feeding you for years.