https://wccftech.com/galaxy-z-fold-3-cameras-stop-working-when-you-unlock-the-bootloader/

Early Galaxy Z Fold 3 users who have finally managed to get their hands on the phones have reported that Samsung is intentionally disabling the cameras on the foldable phones when you unlock the bootloader.

Unlocking the bootloader is nothing new; this has existed as far as we can remember, and there are several reasons behind that as well. For starters, you might want to unlock the bootloader if you are looking to root the phone and tinker with the system files. There is nothing wrong with it as even Google, the company behind Android, supports and even provides detailed instructions on how to pull it.