Anyone who seriously cared about their privacy would not be using any of the commercial LLM offerings. This is the greatest honeypot for profile building the ad tech ever had.
you're worried about ad targeting?
Goes hand in hand with everything else, like price discrimination, including by insurance companies, which in all likelihood are not required to disclose that the reason your health insurance premiums are up is because you asked ChatGPT how to quit smoking.
Ad targeting, user profiling etc. Post Snowden we can reasonably assume that the NSA will get an interface.