If GoG are sharing data with 3rd parties about you in breach of their privacy agreement, then you can make a claim under GDPR regulations.
I encourage you to do so.
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Thanks, I know. My solicitor has already been looking into the options. The problem is that it would have to be taken to court in Poland, which has not been known for enforcing EU regulations well in recent years. Another problem is financing a series of suits against a corporation with practically unlimited resources, while not being allowed to bring a class-action suit. I’ll have to see what my possibilities are and whether is worth pursuing at the end of the day.