I lived through OnLive -- from beta to shutdown -- and that is exactly why I'm putting zero money into these cloud-only game licenses, unless it's a Netflix-style subscription. When the time comes for shutdown, they won't do the courtesy of granting one free license for that game on another platform, e.g.: Steam, Xbox Live, PSN. The purchases will just be gone and people will point at the ToS.

The only way IMO is GeForce Now-style services, where your existing digital library is honored. That or Netflix-style subscriptions like Game Pass Ultimate.