It sounds familiar. I'm sure there was an attempt at a subscription based "Real Life Spy Game" several years ago (>10 ?) already. You would receive phone calls from strangers, mysterious emails, have to check website links, and such.
It wasn't a success as far as I remember, but it was definitely ahead of the times, and also "single player" only . A massively multiplayer game based on the same concept has definitely more potential...
As mentioned above, there was Majestic, which came out about 10 years ago. It was sort of an X-Files conspiracy type thing. I played for a while because I was interested in the tech. You would get calls on any phone you registered, faxes of documents, emails, etc... there was even an alternate web universe where you would search for information and they would inject results for their sites via a plugin in the browser (if I remember the tech correctly). I stopped playing right around 9/11. For me, it just seemed awfully silly to be getting emails about fake "threats" when it seemed like there were some real ones out there.
It wasn't a success as far as I remember, but it was definitely ahead of the times, and also "single player" only . A massively multiplayer game based on the same concept has definitely more potential...