https://www.cnet.com/news/apple-wants-to-protect-you-from-accidental-in-app-subscriptions/

The new step should prevent people from accidentally subscribing to apps, which has reportedly been a problem for those with Touch ID phones. What's been happening is this: Users get a pop-up message asking them to subscribe. When they put their finger on the home button to exit the app, Touch ID instead authorizes it and signs them up for the subscription.

Apple didn't immediately respond to a request for comment.