If you have an idea and are putting it together, you might use Claude for a few things:
- Search the web for related ideas. This could help if someone's already had the idea or if there are things to learn from related ideas.
- Review your writeup or proofs for mistakes and clarity
None of these things make the idea Claude's. Claude merely helped with some of the legwork.
But Claude now has your idea in clear, plain text to train on. The next time someone hits on even a similar idea, Claude might well suggest your idea outright. Not seeing your idea published, the user has no way to know it isn't a novel idea. If the person is less diligent/thorough, they may well publish first and claim it as there own, without any nefarious intent.