on a medium customarily used for software interchange
I would think that 'customarily' implies conventional, not proprietary.. Of course like all words these can be interpreted multiple ways. Wish to test it and see what the courts do?
b) Accompany it with a written offer, valid for at least three years, to give any third party, for a charge no more than your cost of physically performing source distribution, a complete machine-readable copy of the corresponding source code, to be distributed under the terms of Sections 1 and 2 above on a medium customarily used for software interchange; or,
They provide an enjoyable experience, without stupid UI shenanigans.
Well, except for that ugly cashew thing persistently visible on the desktop I never use and killing off the only plasma plugin that would let you hide it.. But that's the only shenanigan really. Stupid cashew.
It is easier to change the specification to fit the program than vice versa.