NEW YORK, Feb. 10 -- MrBeast, the world's most popular YouTuber, has purchased a Gen Z-focused banking app, he said Monday, marking another addition to his sprawling business interests.

The online star, whose real name is Jimmy Donaldson, announced on social media that his company Beast Industries acquired Step, a financial services platform.

"Nobody taught me about investing, building credit, or managing money when I was growing up," the 27-year-old said. "I want to give millions of young people the financial foundation I never had."

Though it offers credit and debit cards, and interest-bearing accounts, Step is technically not a bank, but rather a financial services platform backed by Evolve Bank & Trust.

It was not revealed how muc...