Hi,
It could have been those individuals are
testing the
water, not yet want any major investment into a new endeavor. He/she could obtain your name from one of your colleagues presently/past. Due to privacy or fish and bait tactics, they are not revealling the offended source. If you think the recruiter wants too much information from you before selling your resume, STOP. Cease to do any business with that company. Sometimes those offbeat recruiter firms do better job than any brandname recruiting firms.
The main thing, do not let yourself into the desperate situation, ever.
Regards,
MCao