MrBeast is learning the hard way that teens and crypto can be a perilous mix.

YouTube‘s top creator drew political scrutiny this week when Sen. Elizabeth Warren questioned his February acquisition of the fintech app Step.

Warren sent MrBeast, whose real name is Jimmy Donaldson, a letter with a series of 11 questions, the first of which was whether his company would “allow users of Step to invest in or hold cryptocurrency or NFTs?”

Step is a digital banking platform aimed at teens and young adults that offers savings accounts, a credit-building Visa card that works like a debit card, and a cash-advance program. While not a bank itself, it offers banking services via a partnership with FDIC-member…