The free version is still working for me, but I haven't been running it lately. You are on the paid version, aren't you? Looks like their on to you.
Better stop your subscription!
Edit: I posted too soon! My run was terminated without completing any games. When I retry I now see "You cannot currently connect to a GPU due to usage limits in Colab."
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Dave Sigaty"Short-lived are both the praiser and the praised, and rememberer and the remembered..."
- Marcus Aurelius; Meditations, VIII 21