Nvidia's game streaming service GeForce NOW left Beta earlier this month and you can currently get 90 days "founders"(premium) subscription for free instead of 5,49€ monthly. Providing valid payment information is required but you can cancel out of the subscription without being charged anything anytime before the 4th month begins.
There is also a permanently free basic subscription which limits your session time to 1 hour and doesn't support RTX. Both plans are limited to 1080p probably to ensure performance.
GeForce NOW is following a model that allows you to play supported games you own on Steam/Epic/Uplay without any additional cost and you are using your own accounts and cloud saves. Battle.Net and it's games have been removed few days back because the agreement between Nvidia and Activision Blizzard from the Beta peripd ran put, but hopefully it will be back.
My experience with it was fantastic performance-wise, games perform as if they ran locally or even better (can play RTX enabled without a RTX card) on both Android and PC. Issues are lack of supported input devices (no Steam Controller, Hotas, Wheels) and good but limited amount of supported games.