SilentBleppassin: I don't need, like, love, appreciate, support nor like the toothless Devil-advocate style of trying to make a "discussion,
A forum is not a place for statements. If you don't want people to answer, then don't post.
To be honest, I am not even sure that newsletters are activated automatically by clicking on "free game".
GOG follows the european guidelines about handling of personal data quite literally (I don't say 'laws' because each state has to make his own laws to follow these guidelines). And these say that it has to be opt-in, not opt-out. Even Epic does that.
edit: Of course the button to accept newsletter can be a lot bigger than the one declining them, just like we see it with cookie settings. If you don't want cookies, you sometimes have to look for the button. So from my point of view the people who receive unwanted newsletter just didn't take a close look at what they were clicking.