Am I susceptible to plagiarism if I tell my ideas to chatGPT?

For context, I like world building and I am making a medieval fantasy world for role-playing. I saw someone in social media saying they could play RPG with chat gpt and I wanted to do the same with my own world, tho I am afraid of plagiarism.

In a technical way, could chat GPT store my ideas and suggest to other people if they asked for these kind of ideas? If so, how risky is it? Am I reasonable for being concerned or no?