Not related to recruiters, but I got my first AI robot telemarketing call at work last week. It was fairly obvious because Its Voice And Cadence Sounded Rather Like The TikTok Caption Voice Lady but I imagine many less savvy people might be fooled at least briefly. I clocked it by the end of the first sentence of its pitch (wherein its script included lying about someone at our company requesting a "call back" from whatever organization this originated from, which is not something we would ever do in any telemarketing encounter). I asked it, in my best Strong Bad impersonation, if it was some kinda robot. Rather than give a direct answer it responded, "That question is a little outside of my scope," and then sat there silently and did not seem to be able to proceed unless I prompted it by saying something else.
So I hung up. I'd highly doubt these things are providing the ROI people wish they were. The real danger is going to arise if they ever manage to make them convincingly sound like anything other than a robot.