Original Link: http://www.marco.org/2012/03/08/learning-from-competition

I experimented with custom fonts in Instapaper last year, but my efforts fizzled out.
Before iOS 5, rendering custom fonts in a UIWebView on iOS was extremely buggy and slow.
And nearly all of my licensing inquiries to font foundries went unanswered, so I couldn’t legally ship any of the fonts I wanted even if I
could get them to work well. So I tabled the custom-fonts idea.