If it's worth saying, but not worth its own post, then it goes here.
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I've made an app that would greatly benefit from being open source in order to allow users to write their own plugins. How do I make it open source while still satisfying my capitalist rent-seeking exploitative desires?
You could publish it as GPL3 or something more restrictive. If someone else has a plugin that has commercial potential, they'll need a more permissive license.