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It's not about that.

They started out "between a rock and a hard place". I'd say thats probably the primary reason.

This is unfortunate as I hadn't heard of mixwit until just now.

Actually it says "between rock and a hard place." I think the missing a is significant. Especially because they italicized "rock."

starts inserting random grammar errors and italics in posts and comments to invite intrigue

yes, it is funny.