I would pay for an official cyberpunk dating game. That said, I'd pay for anything with Cyberpunk on it so it's not a very good example of anything.
I think that this project does not hurt anyone and is free. If the fans are the ones who have to made new content, then go ahead.
It's just a harmless dating sim some fans made, I don't understand the negative reaction. Not everyone liked existing romance options available and made something for the characters they like. It's a free, fan made project that doesn't take any time or resources away from Cyberpunk. What's so bad about that?
Eh, let's not pretend like the optional quests for the various side characters you meet in the game weren't already veering into elaborate dating sim territory. I'd argue Witcher 1 and 3 were guilty of this too. it makes sense that this is the sort of fan content that would follow as a result.
Either way, it's a free fan project, so of course CDPR would "allow" it.