The only question I have is why the hell I got that mail too? I never played Gwent in my life. I don't even have it in my library.
I do have GWENT, I even thought about installing it once, but then I made a sort of, "Mmmmneeeeeh" of complete noncommitality, and went back to ignoring it. Clicking it in my library results in quite an amusing sight; there's not even anything there.