What sets this apart from AI generated spam?
The thing is that Sarah isn’t a mere outreach tool where you just keep spamming people with standardized messages until they either reply or block you… Sarah should be considered exactly like a human in the sense that it not only outreaches but actually converses. So to answer your question - it’s different from AI generated spam because it’s not spam. Unless you consider humans reaching out to you to promote a service “spam”.
Otherwise I don’t really understand your question?
How is it tricking you? You receive a message and then you are the one who decides whether to reply or not.
Does the message clarify that you're talking to an AI? If not, you're tricking the person into thinking they're talking to a human