Mark Mandel from Google Cloud Platform ran a demonstration at Google Games Dev Summit of a way to globally run game servers and chose STK as the game to use.
youtu.be/OF8EtzQ4e6c
'supertuxkart' appears in the code @ 9:10
First mention of STK @ 9:48: "[...] the game that we're actually gonna be using is called SuperTuxKart. It's a really fun multiplayer racing game that some people may already be familiar with because it's been around for a while. It's really cute and adorable."
Runs the game @ 14:18, adds 3 AI bots and starts a test game to demonstrate the server.
(I personally am not a fan of many parts of the Google/Alphabet company, but I can appreciate the good things being done there as well.)