Because the author (who does not control how NYT subscriptions work) does mention that in the story:
> About 30 sites made it easy to sign up for services but particularly hard to cancel, requiring phone calls or other procedures. The Times requires people to talk with a representative online or by phone to cancel subscriptions, but the researchers did not study it or other publishing sites.
And highlighted it on her social media promotion of her work: https://twitter.com/jenvalentino/status/1143531833147240449?...