Some companies may save money by employing LLMs to do shallow things. Others may not. Also, LLMs are not all AIs. AI is a broad field with many models and applications that were already omnipresent in our lives but less marketable to the general public as revolutionary, such as spam filter. AI is NOT a gimmick per se. Some users are.
P.S.: consider that when there are huge investments in something, people will do anything to see a return, including paying other people to create hype.