This restriction can always be overridden by the user. Until macOS Sequoia one could hold the option key when launching the app for the first time to remove the Gatekeeper warning. This option is no longer available in macOS Sequoia .
Starting from macOS Sequoia the steps to remove Gatekeeper restriction from the app became deliberately harder, in order to discourage users from installing non approved apps. Still, the override option is always available.
There are two ways to approve a newly-downloaded MakeMKV app to run on macOS Sequoia or any earlier version.
Method One - Follow the steps on Apple support page . You would need to open computer settings and enter your administrator password. Note - the only reason Apple asks you to enter the administrator password is to make the action of approving an unknown app look scary enough. There are absolutely no technical reasons for asking the password.
or
Method Two - Launch the Terminal app and execute the following command once. It will do the same, without opening thousands of windows or asking for any passwords.
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xattr -c -r /Applications/MakeMKV.appEither way, after the "unidentified developer" restriction is removed, MakeMKV could be launched as usual.