YouTuber MrBeast challenged people to keep their finger on an app. It went for 70 hours.

Jimmy "MrBeast" Donaldson is at it again.

The YouTuber, who is known for his elaborate stunts and cash giveaways, challenged willing participants to join his "Finger on the App" competition. The premise was simple: Be the last person to take your finger off your phone screen while the game plays and win up to $25,000. Though...