From reading a few posts in different places, it seems platon42 had an argument with a someone who is a moderator on a discussion site, and found his replies being censored. Out of disgust he took down his site, and the others did so out of solidarity.
The dispute was over TLSFMem. I would have thought that the whole Elbox episode would have caused him to give up, not a small incident like this. Then again, this could well be the straw that broke the camels' back.
I don't think these guys have left for good. They are big fish in a small pond. If they wanted to switch to Windows they could have done that long ago. That's just my opinion.
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Vapir One