[priteau]

Unless it changed recently, Marco Arment, the creator of Instapaper, is an advisor to Arc90, the company behind Readability (http://www.marco.org/2011/02/01/readabilitys-new-service)

[DTSmith]

Marco is not currently listed in the advisor team at the bottom of their about page (https://www.readability.com/about). Would seem like a conflict at this point and makes sense for them to move in separate directions.