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Let’s make games open source, so future generations can enjoy them
(jairajdevadiga.com)
I think it could be viable for a company to release a game with a “5 year FOSS promise” or something similar
Yes, that is one of the options I mention in the article. But there are games that are open source from day one, such as Mindustry, which have seen commercial success.
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.