This seems to be a common snark whenever someone known for (gasp) using Apple products complains about lack of openness. Because clearly these two things are connected, except for the part about them not being connected at all. (Frankly I have no idea what "no freedom in terms of interoperability in your daily system" even means. What is it my Mac and iPad are failing to interoperate with?)

If I construct a popular online social network, I could run it on Debian, code it in Emacs, have all the source code on Github, genuflect to a picture of Richard Stallman daily, and still have no open APIs for users to interact with their data. If most major players on the Internet lock your data down, then many common uses of the Internet will in a very real sense become proprietary even if it is running entirely on free software.

I'm sure it's fun to smugly go "well, you use iOS so you should like closed things," but it kinda betrays a significant distance between you and the point.