It's not really about the cost. It's about the principle of having to pay any amount of money to be able to do development work at all with your preferred choice of OS/editor.

Attaching a price to your ability to onboard a language with your favorite workflow changes how you view that language and the motives of its maintainers when compared to the alternatives for that platform. Java has no such barrier to adoption on Linux, for example, because IntelliJ happens to have a community edition.