Senator Elizabeth Warren (D-MA) requested information Monday regarding Beast Industries’ recent acquisition of Step, urging the company created by YouTube star MrBeast to move cautiously as it weighs crypto for the mobile banking app designed for young investors.

In a letter sent to Beast Industries CEO Jeff Housenbold and MrBeast—whose real name is Jimmy Donaldson—the crypto critic argued that the firm’s history “raises concerns about its ability to manage a financial technology company, particularly one targeting children and teens.”

The 12-page letter focuses on Step’s previous involvement in crypto. In 2022, the app announced that it had become the first platform in the U.S. to allow teens, with the…