I believe they switched to phpBB - probably because later versions of vBulletin are 'not as good'.
I haven't joined either, mostly due to the infamously obsessive editing. When all is said and done though, I'm pretty sure it's in the terms of registration and they are free to run it how they like. It's not as if you need to join the forums to use the OS either (many Linux users seem to miss that point all too often).
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