The thing is, I have to trust that PG wrote the words saying he wrote his own response. What stops ChatGPT from saying those same words? I'm wondering what way

The thing is, I have to trust that PG wrote the words saying he wrote his own response. What stops ChatGPT from saying those same words? I'm wondering what ways/technologies we'll create to tell if someone actually generates text themselves. Right now, I can feel a rising desire to avoid text-based communication with people, almost a fear of getting catfished by text.