OpenAI is borrowing lots of ideas out there as they search for ways to make money. If you have a github project then they can borrow your idea. However if you have an idea that's closed source or behind an API, your idea could be advanced enough that it might not be easy for them to figure out what's going on. So I don't think they are in position to crush all agentic startups. If you use their API and they peek into your prompts, then they can figure out a good part of what you might be doing. By them venturing off into applications, I don't trust them. For my experiments, I never use OpenAI. Good prompts are gold in this age, don't send your prompts/data to any entity you don't trust.