alt Hacker NewsPeople refer to games with proprietary assets as open source all the time. The source code is open - the assets are not. For one example: https://news.ycombinator.com/item?id=28201265 / https://github.com/beyond-all-reason/Beyond-All-Reason/blob/...
Source as a word has a meaning that doesn't include non-source things.
That’s an open source engine, we already have a word to define what that is.
And we have Open Weights to define what those are.