You raise a point that strikes me as odd, but perhaps I am not up to date on what is considered FOSS nowadays. In what way will this lead to `truly` FOSS? Sure

You raise a point that strikes me as odd, but perhaps I am not up to date on what is considered FOSS nowadays. In what way will this lead to `truly` FOSS? Sure, the URL shortener project is open-source, but neither Github Pages nor Github Issues are free-as-in-libre open-source projects. What is being show-cased here is a neat idea, but ultimately the dependency on Github's Pages and Issues will make it difficult to port to other systems, thus you are not really free to do with as you please. So, while the URL shortener program itself is FOSS with all the right licenses, doesn't the direction you are proposing lead to more capture by these non-free platforms, as the value they offer for free-as-in-beer becomes more and more difficult to ignore?