Okay, so, I've just done a review of the #moderation features in both #Lemmy and #kbin, thanks to @stux and @ruud
I've written up a fuller report on the IFTAS matrix, but the tl;dr is: if you care about user safety, do not deploy either of these.
They do not feature comprehensive or well built moderation tools, and you will not be able to effectively moderate instances running this software.
You are better off waiting to deploy these once they mature more.
Like, if you're totally fine with not being able to effectively moderate a server you operate, then by all means, test out #kbin and #lemmy, but encouraging folks to use either en-mass as if they're anywhere near the calibre of Mastodon or Pixelfed* then you're in for a very very bad time.
Alpha software does need alpha users to test and provide feedback, but we should be VERY careful recommending alpha software to mainstream massive audiences as an alternative to $centralisedPlatform.