Because its not ai, it's lookahead autocomplete
I'm sorry, but you don't know what artificial intelligence is. ChatGPT is a generative pretrained transformer (GPT) is a type of transformer model is a deep learning architecture is a type of machine learning is a branch of artificial intelligence (where, for context, the other branch of AI is of a fixed programming, like an opponent in Video Chess for Atari).
You don't have to like that the field is called AI; you do have to acknowledge it's been called that since 1957 (just a year after Logic Theorist) and that LLMs objectively fit squarely within said field.