If your data provider claims to know everything about your website visitors, you should be concerned.
It’s really hard to do authentication well. You can’t fully authenticate healthcare professionals (HCPs) based on first and last name only, or even based on a name and one email address – though that’s all the information many websites require for registration. Instead, a thorough authentication process requires first-party sourcing, domain matching, cross-checking against the American Medical Association Masterfile, and ongoing quality assurance.