Thing is, OpenAI/Anthropic/etc. are demonstrably taking up those ideas. There actually were (are?) AI PDF reader startups and AI research assistant startups.

Thing is, OpenAI/Anthropic/etc. are demonstrably taking up those ideas. There actually were (are?) AI PDF reader startups and AI research assistant startups. (And AI coding startups, AI video startups, image analysis startups, etc.) "AI startups," if they make sense, seem to have a very short shelf-life. They're either overtaken by the continuing improvement in LLM context windows, or, if there's a real and general unmet need for what they offer, the giants will tend to integrate it.