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Any works you produce using the GPL'd asset must also be GPL'd. So I can put a price-tag on my movie, comic book, AI model, or tutorial, but anyone else can also copy and redistribute my work with no legal recourse from me. It's hard to see the feasibility of commercial use.

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The source for the engines of the first three quake and doom games were open sourced. I purchased those games after that happened. Worth mentioning that the engines were open sourced, not the assets. The assets are obviously a big part of the experience. But if not for the open source versions of their engines (prboom, ioquake3, etc) I'd not be playing these games today.

There's plenty of GPL software being sold. Mostly things that are niche enough that nobody cares to repost the source code.

And of course with AI models you could post a AGPL version publicly and sell more permissive licenses.

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