I'm aware of that example, it was on my mind when I made the comment.
I suppose the only way it could work is if there is a special incentive to buy it. Some video game companies do this, they have the engine open-source, but all the assets are proprietary.
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The one thing with doing that myself that would worry me, is some community project releasing free pre-built versions would spring up.
That's essentially what happened when XChat (IRC program) started to charge for windows builds.
I'm aware of that example, it was on my mind when I made the comment.
I suppose the only way it could work is if there is a special incentive to buy it. Some video game companies do this, they have the engine open-source, but all the assets are proprietary.