They are all like Microsoft Office where you have to pay for upgrades: one way or another you will, eventually, have to pay for an upgrade. Software is expensiv

They are all like Microsoft Office where you have to pay for upgrades: one way or another you will, eventually, have to pay for an upgrade. Software is expensive to develop and eventually a constantly expanding market won't be enough to sustain development costs. Eventually everyone who wants one will have a copy of Instapaper and then something will need to change to pay for its development.