Once I woke up a bit more I had another look at the article, and this phrasing certainly makes it sound like it needs approval at some point:
Due to a licensing dispute between NVIDIA and Activision in 2020, GeForce NOW lost access to all Activision-Blizzard games.
Perhaps though it’s a case of “Better to ask for forgiveness than permission” and they just add games until someone tells them to pull it off, I’m not sure. It’s been 4+ years since I looked into GFN, I tried it out during the beta period but I don’t believe I’ve used it since then.