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You're completely right about courses and software the maintenance overhead is real.

But if you look outside of content/SaaS, true 'create once, sell twice' models still exist in pure asset licensing. Things like custom fonts (.ttf), stock audio loops, universal 3D textures, or patent licensing require virtually zero maintenance once packaged. The key is creating raw raw materials for other creators, rather than end-user content that AI can easily scrape and summarize.