https://www.techradar.com/news/oppos-invisible-under-display-camera-just-made-notches-and-cutouts-irrelevant

In the race to provide users with ever more screen real-estate, smartphone manufacturers have worked hard to make their selfie cameras as unobtrusive as possible, implementing solutions such as notches, pinholes and even mechanical pop-up cameras.

While many of these approaches are undoubtedly clever from a design standpoint, all of them can be seen as an engineering compromise – nobody truly wants a notch or pinhole cutout on their beautiful handset, but they'll take one if they have no other choice.