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FWIW, I have downloaded a couple of games from GOG over the years, both free ones and paid ones, and they send me emails only very rarely.

It might be different this time, but their track record so far is pretty good.

(Also, I think you can revoke that consent in your account settings, but I haven't looked into that, so it's pure speculation.)

Surely you must have more than one email address?

You can unsubscribe right after claiming it, by going into your GOG profile settings.

I don't even bother hunting for checkboxes to turn off when making accounts anymore. Any email they send I just instinctively mark as spam.

Technically yes, but it's placed in the fine print which is of course will be missed by some people.