ChatGPT as a system involves an unreliable LLM chatbot and a series of corrections efficient enough to give the impression of reliability for many fields and these together
feel like the future - enough to get a "code red" from Google.
It's worth remembering that back in the day, Google succeed not by exact indexing but by having the highest quality results for each term - and they used existing resources as well as human workers to get these (along with pagerank).
What you have is a hybrid system and one whose filter is continuously updated. But it's a very complicated machine and going from something seemingly working to something satisfying the multitude of purposes modern search satisfies is going to be huge and hugely expensive project.
https://gizmodo.com/openai-chatgpt-ai-chat-bot-1850001021