Why is News.app greyed out in the Finder?
Figured it out:  I live outside of the regions where Apple News is available, so the app would normally be hidden in the Finder.  However, I have &quot;Show hidden files&quot; enabled in the Finder, so the app is visible but greyed-out.
Per Wikipedia:

During the 2018 WWDC, Apple announced that the Apple News app would be ported to macOS and be available to users in Australia, United Kingdom, and United States starting in macOS 10.14.[9] The app is installed by default in every region but is not made visible to users outside those three regions.[9]