https://wccftech.com/samsung-explains-why-galaxy-z-flip-3-has-no-in-screen-camera/

Despite Samsung having launched two foldable smartphones yesterday, they have a swath of differences between them. For one thing, the company incorporated an in-screen selfie camera on the Galaxy Z Fold 3 called UDC technology but left out the feature on the Galaxy Z Flip 3. If Samsung wanted, it could have easily introduced the same sensor on the less expensive foldable, so why did the company choose a different direction? Here is the answer you seek.

Samsung explains that the form factor of the Galaxy Z Fold 3 makes it ideal for it to feature an in-screen front camera, according to Sammobile. The company also states that the front camera of the Galaxy Z Flip 3 is also an important aspect to capture selfies. This might be a subtle way of telling us that the in-screen camera of the Galaxy Z Fold 3 cannot match the 10MP shooter belonging to the $999 clamshell smartphone, and that is understandable.