Nintendo has advertiser That players cannot share information about the playtest online, this includes posting screenshots and videos on social media:
By registering to participate in the Online Play Test, you agree not to share information about the Online Play Test publicly, including sharing screenshots or videos from the game on social media.
It seems a bit odd that Nintendo doesn’t allow players to share feedback and information online when the goal of a play test is to get such information, but perhaps it is more concerned with keeping track of how the game holds up to a larger player base.
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