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The sum of the note and the gpl doesn't behave as though the notice has any precedence over the gpl. It behaves as additional restrictions and a license that allows you to ignore the additional restrictions. I'm no lawyer but it seems like it isn't achieving what you want.

But you publish it on github? Anybody can simply ask copilot to make the same app as yours and be completely not bound by any license.

Maybe look into dual licensing. You could allow all free use but require a custom license fee for all commercial use.

>Maybe look into dual licensing.

No, no, not at all as a FOSS developer.

> I’m planning a non-intrusive in-app prompt to remind users about donations something subtle, because many users forget once they start using the app, rather than only seeing the donation info in the README.

As I mentioned previously, the above approach seems to be well enough and good.