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Let’s make games open source, so future generations can enjoy them
(jairajdevadiga.com)
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Be the change you want to see. Make some games worth playing and release it as a FOSS and prove it can be a commercial success as well. See how it goes.
Asking people to release their work for free while providing very little incentives other than your own benefit aren't going to convince people who need to put food on the table NOW, without relying on miniscule probability of popularity or success after pouring years of your time.
I have mentioned examples of games that saw commercial success while being open source. And of course, delayed open source is also an option as some other users have said here.