It wasn't originally designed with GUIs in mind but that doesn't necessarily mean it would be bad at it. Some people don't consider Go well suited for GUI programming as most of that large GUI platforms are traditional Object Oriented frameworks that wouldn't work as well with Go.

Google and Apple haven't adopted it as they were already developing languages/platforms targeting GUI development (Dart/Flutter and Swift respectively). Also Go is a young language targeting a different niche so there was nothing pushing it this way.