It's not that we don't want to pay for software, and I don't think that's what OP meant when he used the word "nonfree". It's just that we need the four freedoms in case the software takes a sudden turn in a direction we don't like.

Now you're going to ask: How is it possible to support the four freedoms and still charge for the software?

And my answer is: I have no idea, and I don't care. It's not my job to come up with a business model for you, I'm just stating my requirements.

I see. Perhaps I commented too fast.

I don't think it's that big of a deal for a text editor, though.

One thing is if you're a designer and all your files are PSDs and you're locked in with Photoshop, but if Sublime Text dies you still have lots of other editors that will open your plain text files: Atom, Eclipse, etc.

Once you have trained your muscle memory on a given editor, switching becomes a very big deal.

None of the four freedoms mention it having to be free. ;)

Maybe you should care. There is a possibility that in some cases your requirements are contradictory.

It's free as in "liberty", rather than cost.