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Is this their cloud gaming service? It was free?
Yes. There are tiers and the free tier is limited to 1 hour play sessions.
There is a free tier which limits you to 1 hour playtime sessions and does not let you use RTX effects.
It was straight-up free (as in: no tiers, just free) for a long time to early adopters of the Nvidia Shield. I can’t remember when it was introduced but I think it was with the first iteration of Shield TV.
and afaik it’s the only one that is actually free