It depends on the usage.

If the user is reading the response and then thinking about it and adapting the suggestions to their own style of speaking, maybe they'll learn something over time. Studies have shown that students who use LLMs as a tutor do improve their understanding of material.

If they're copy/pasting like most of the world, then there's evidence to suggest that they'll actually get worse at the thing they're offloading to the LLM.