GeForce Now is a game streaming service. It was previously possible to use it on deck, but Nvidia is making it much easier to install and get set up. They also recently improved gamepad navigation of their service.
To install, go to their install page in desktop mode and scroll down to the steam deck option. Download and run the script.
The advantage of streaming services like this is getting great performance on lower power devices, and minimal battery usage.
I strongly disklike any subscription, but having to choose between paying for a high-end gaming rig that I rarely have the opportunity to use and paying 10$ or so for renting a cloud VM instance for the few months I get through a game, I choose the latter. Also, upgrading hardware is somebody else’s problem.