couldn’t log in with a kbin account (which went against the whole 'you can use one chunk of the fed to engage with others!" spiel).
In fairness, it goes against the speil in the same way that "I tried to download Internet Explorer on Linux" goes against the "you can use any computer to access the internet" speil.
You can access all of the same content from websites running Lemmy or kbin, but they're still totally different pieces of kit.