The cost of software maintenance is not even close to zero. Unless you are someone like DJB (or even then) your software will need to be updated and bugs will n

The cost of software maintenance is not even close to zero. Unless you are someone like DJB (or even then) your software will need to be updated and bugs will need to be fixed. TFA specifically calls out the assumption that a one off (essentially micro) payment entitles you to lifetime updates and I think that is a very fair criticism.