He also mentioned on his podcast that he's been thinking about fonts for a long time, but licensing models for apps are complicated. Forget the details, but I think Readability may have caused him to revisit the issue and find it's now feasible with some negotiation.
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Marco mentioned their lovely fonts as the impetus for the change: http://www.marco.org/2012/03/08/learning-from-competition
Edit: Even without that context, it seems petulant & rude.
Marco said everything that needed to be said. Meaney should have kept smugly quiet.
He also mentioned on his podcast that he's been thinking about fonts for a long time, but licensing models for apps are complicated. Forget the details, but I think Readability may have caused him to revisit the issue and find it's now feasible with some negotiation.