Re: [Trisquel-users] F-Droid Appstore criticizes application for using "non-free network service"

[tegskywalker]

I agree. Many of these servers are probably running a flavor of GNU/Linux or  
BSD and free software applications like Apache, MySQL, nginx, PHP, or Python  
to serve the data. As long as the output data that the server returns is in  
an open format (like JSON or XML) then its not a big deal.

On top of that, if the software on their server is built by them and for them  
for a custom purpose, then they have no obligation to share. If they do  
distribute their custom software, then that's another story.