There's an easy product fix for this. Offer every game purchase with the option for a one-time key conversion, ideally managed through the game publisher. In the event of a Stadia shutdown you could easily port your purchase over to another single platform of your choice. This stragegy de-risks the platform and would go a long way toward alleviating consumer fears.

We saw similar strategies around the launch of Steam. Sure you're just buying a download code, but if you send us $5 for postage we'll mail you a physical disc to go with it. Same concept.