Any ideas or phrases that are not 100% your own original work must be attributed to the person or computer program that created them.
These AI tools provide great conveniences and assistance to help students understand the material being researched and to help produce quality writing about the topic. But, these tools must be used to aid in understanding and production or else you are not writing. The work is only your own if you start the writing process on a blank piece of paper or a blank screen and fill it up with your words. Only after that part of the process is done can one use the AI tools available to aid your writing.
This might not be true for other forms of writing. For example, if a doctor uses AI to generate a reference letter for a medical student this could be ethical as long as the letter expresses the doctor's sentiments about the student in an accurate and convincing manner.
But, students at a college or university are learning to write and participate in generating new writing on research topics. If you use AI to write for you, you are sidestepping learning to write and misrepresenting your understanding of a topic and your ability to express your understanding.
Students at a college or university are here to learn. They are here to learn to think critically, increase their understanding of topics, and learn to express their understanding of the topics and their unique thinking on it. AI tools can be used to increase the speed with which many of the research and writing processes can take place and they can be used to increase the research and writing abilities of the students. But, if they are used as a substitute for doing the work themselves, students will rob themselves of the education and skills needed to work in a world that requires creative thinking and innovative production and of the ability to live successful lives filled with lifelong learning.