True, but the same was said for Instagram and Twitter. They both still have a public API for developers and then cracked down on the third-party apps and clients on the App Store with a policy change. Sure, developers can still use these public APIs as long as they don't release an app that is a full clone of their official apps.

If Instagram, Snapchat, Twitter and Discord can draw the line on third-party clones, with the release of the official GitHub apps, they can also do this too.