Bypass Paywalls for Wall Street Journal, New York Times, Financial Times

Author works for a major newspaper publishing conglomerate... what is going on here?

Quote from blog About Me page:

>Currently I work for Hearst Digital Media [https://www.hearst.com/magazines/digital-media] to help building enterprise media platform.

I've always marveled that The New York Times can know exactly how many free articles I've consumed across different apps/entry points, but cannot ever keep me logged in.