The $10K/day was actually coming from the large egress fees they were getting for transferring the models and agents from Google Cloud Storage to the Colab notebooks. I think if you were to serve the game as a web app you definitely wouldn't need one instance of a 12 GB GPU for each user. But the thing about Colab is that you need a Google account to use it, and you run your own notebook, independent from the author's account.