Fun fact: the games aren't canon. Sapkowski initially said that it's a continuation of the books and approved the general script, but then he flip-flopped and said "nope". So they basically can go crazy.
Well, at the very least it'll give some closure to his story line that started with the novels.
Did he say why he changed his mind?
Sapkowski is, in simple terms, kind of a prick. He in general has very little regard for video games and while he has no problem with his works being adapted to other mediums - he said he thinks the game is a fine adaptation - he holds them as completely separate entities due to the fact that he didn't write them personally. He maintains that the games are merely adaptations (he's very adamant about using that particular word), not continuations and if he ever returns to the Witcher universe, he won't take them into consideration at all - there's a very unsubtle implication in the way he said it that he doesn't think anyone could match up to his own writing prowess. This also has a positive side, though, since he doesn't intend to interfere with the writing process in any way, including consulting and he has no problems with issuing the license.
Andrzej Sapkowski generally has an aura of condescension around him and he's not the most pleasant person. I'm pretty sure he initially called the game canon around the time it wasn't supposed to feature Geralt as a protagonist and maintained it up until around the time the game finally came out - I think he underestimated the medium and CD Projekt RED and is simply too stubborn to admit that it's something more than just a video game at this point. The interview in which he last spoke about this issue is from Summer 2012. I'd send you a link, but I don't think it's been translated.
Wanting to retain creative authorship of one's own literal creations while still allowing them to be adapted by and speculated on in different mediums by other artists, and then complementing those works for their quality but maintaining that they are not part of the canon of the original works does not make one a "kind of a prick," at least not in my view. Far from it. Sounds more like regular artist behavior.
I haven't read any Polish interviews, since I don't speak the language, only the first five books that have been translated into Finnish so far. I'll have to take your word for Sapkowski coming off the way you describe in interviews. But even if that's the case, it's hardly unexpected in the world of art. Nothing people have said that I've read so far has given me the impression that he'd be an asshole in any evident, factual sense, but I still hear this complaint often enough on the internet. Is it just because people want really badly for the games to be canon with the books? If so, why? Or is there some other, perhaps cultural, thing here that I don't understand?
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