Licensing models
One-time purchase. Subscription. Revenue share. Various depending on marketplace.
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IP verification hard
Buyer inspects prompt before purchase in some models. But prompt then can be leaked. Trust hard.
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Marketplaces
PromptBase (biggest). PromptHero (mid). Hugging Face Spaces (indirect). Anthropic/OpenAI don't run marketplaces (yet).
Enterprise trend
Enterprise prompt libraries emerging. Internal repositories with governance. Vs external marketplace.