I personally got multiple offers of interest from separate phone numbers that all followed an identical script. This pretty much gave it away.
Similar tactics involve "hybridvin.com", and basically all kinds of other sites that aren't Carfax.
What I usually do is tell people to get their own report(s), and if they buy the car, I will reimburse them for the cost. That weeds out the liars and scammers.
The various scammers have been kind enough to provide a list of scam sites, current as of November 2023:
Of course, as new domains only cost a few bucks a year, these sites will be endless.
To pay them back, I've taken to sending them random science facts from this website.(which is actually legitimate, and fun too!).