GOG is breaking off from CD PROJEKT with 100% of it now owned by one of the original co-founders, Michał Kiciński, who is a co-founder of both GOG and CD PROJEKT.
With this move, GOG will continue operating independently but there’s an agreement that’s been signed between CD PROJEKT and GOG for future cooperation including releasing games on GOG from CD PROJEKT RED. The purchase of GOG came at a cost of PLN 90.7 million and Kiciński continues holding their shares in CD PROJEKT too as co-founder but now owns 100% of the shares in GOG.


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Rules:
Michał Kiciński is not the owner of CD Projekt. He was a co-founder, but left the company in 2010, though he still owns shares in it.
Ah, okay now this makes more sense. I misread and thought he was the owner of CD Projekt, and he got his own company to sell GOG to himself. Thanks for the clarification!