By default, macOS allows users to install only approved apps from developers who are registered with Apple and have verified their apps for use on Macs. If an app's developer doesn't register with Apple or skips the verification process, you'll see the error "Can't open because the developer couldn't be verified" when you try to install the app.
Mac Os || How to bypass (FIX) "cannot open because the developer cannot be verified"
When this error occurs, the app cannot be installed or opened. Usually, you will see an error message like:
While Macs are less likely to get viruses than Windows PCs, they can still get infected. Apple has a Developer ID system and an app review process to reduce the frequency of users being exposed to malware on macOS.
Developers must register with Apple and submit their apps for review. If an app is free of malicious code such as malware, the app is signed and approved.