AI is a massive liability. If you use it without informing your client and they get sued because you intentionally or unintentionally ripped someone off, that's a problem.
It's also a problem because AI can't be copyrighted, they have no rights to the work, anyone can use it.
clients do care if you used AI because they are paying YOU to do a job, not an AI
don't believe AI penny farmers who have never worked for a client before.