How do I completely stop the Editor from making calls to URL https://www.google.com/generate_204 ?

We’ve encountered this for our project as well. After some digging around the source, it turns out you can completely disable this SHomeScreen widget through the .ini files. Just add

[ConsoleVariables]
HomeScreen.EnableHomeScreen=0

To Config/DefaultEditor.ini in your project. It basically controls the initialization here and the CVar is declared here.