YouTube's premier creator is moving into the teller window. Jimmy Donaldson, better known as MrBeast, announced Monday that his company, Beast Industries, has acquired the teen-focused banking app Step.

A 12-year-old was surprised with his first bionic arm by YouTube megastar Jimmy Donaldson - known as MrBeast. Kai Pollnitz, who was born without his right hand, received the custom-built prosthetic at an Open Bionics clinic in Austin, Texas.