Honestly, I wholeheartedly support this move. For a couple of (obviously subjective) reasons:
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Lemmy/kbin isn't ready. If Beehaw staff were able to fork their own version of the base code with their moderation etc. design preferences in mind, this would be another thing -- though even then it might not be enough to be worth it with the headache of fediverse moderation.
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Closed system/community is more personal, hence more productive and less noisy. At least before it outgrows itself.
What I'd hope but is also more work and potentially creates conflicts, is that the new platform provides good moderation logging etc. Which I think is key feature to ensure trust and self policing.
More likely is that Cyberpunk was that big of game that neither platform wasn't willing to risk losing sales for not being out day 1.