https://wccftech.com/geforce-now-activision-blizzard/

GeForce NOW lost the Activision Blizzard games that were available during the service's beta, and it has been confirmed this was due to a misunderstanding.

As reported by Bloomberg, Activision Blizzard wanted a commercial agreement with NVIDIA but the company that the beta's agreement extended past the service's launch. Despite the misunderstanding, NVIDIA hopes to bring back the titles from the publisher in the future.