They do have their own index which is used to detect how many ads the website has etc and for small web / blog searches, but they use meta results to have more

They do have their own index which is used to detect how many ads the website has etc and for small web / blog searches, but they use meta results to have more results. Also, they do have integration with multiple LLMs - ChatGPT, Claude, Gemini, Mistral and their own