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.

Okay, but then the argument that Apple is charging them to certify their software and that is excluding hobbyists falls away doesn’t it? Now you’re not a hobbyist.