The New York Times sues OpenAI and Microsoft for copyright infringement::The New York Times has sued OpenAI and Microsoft for copyright infringement, alleging that the companies’ artificial intelligence technology illegally copied millions of Times articles to train ChatGPT and other services to provide people with information – technology that now competes with the Times.
You did ask if ChatGPT had ever sighted sources. Bing uses it and besides, you can ask for that manually.
Whether it defeats the purpose depends on your original purpose.