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I agree that this is the most important thing to know about how the GPL works.

I disagree that it is an important thing about what is its intent

I disagree: the intent of the GPL is to preserve freedom; the way the GPL preserves freedom is by preventing you from removing it by changing the terms.

If I'm choosing a license for a project, it's important that I know that changes other people make will be available to me under the same terms as my own code.

A license that requires you to make the changes available but allows you to restrict my use of those changes is plainly in contrast with the intent of the GPL.

I'll try another rewording: "GPL is a license designed so that, no matter how many times people alter your code, a user that gets the program also gets the source code. To do that, it forbids developers from using your code in some contexts."

better ?

(sure, there is a tradeoff between comprehensibility and precision ...)

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