The disadvantages of duplication are greatly reduced in the world of AI. From my experience it can easily detect the duplicates and refactor code safely. On the other hand, code without abstractions is easier to read and easier for AI.
With AI, we really need to rethink the clean code principles.
There is no reason to tie the method of payment together with the method of distribution. They could distribute it through brew along with an optional license configuration.
Downloading a cli from a browser is not convenient anyway. You need to copy the downloaded file somewhere that is loaded into the PATH.
And also, software that is downloaded from itch.io app does not require notarization.
With AI, we really need to rethink the clean code principles.