>Proprietary software doesn't give you the freedom to read and modify the source code. The software license forbids learning about it.

This is true. However, it is still possible to be taught to code on a Windows machine in Visual Studio, or in Java for Android, etc. Your point of view has merit but it also has a limited context. The tools do matter and some of those tools are closed-source.

>There's a lot more to CS than learning to be a code monkey.

And yet, sooner or later everyone has to eat.