While this may look like a good reason not to use the service, I learned of an even better reason just now from this article:

At the start of next year, GeForce Now will roll out a 100-hour monthly playtime allowance to continue providing exceptional quality and speed – as well as shorter queue times – for Performance and Ultimate members

Apparently you have to wait in line?!

It doesn’t change the fact they’re getting paid a ton for a comparatively small amount of work.

Beta testers should get a discount, or even get paid, in exchange for writing good bug reports. These people are fools for paying extra for earlier access to a bug fest.

I would never pre-order a game. That just makes it harder to refund it if it sucks.