From Stripe support: “This information is required as part of Stripe’s mandatory identity verification requirement: Stripe must collect, verify, and maintain information on the individuals associated with every US Stripe account, as required by our regulators and financial partners. This is intended to promote transparency and prevent individuals from using complex company structures to hide terrorist financing, money laundering, tax evasion, and other financial crimes.”
For more resources:
Verification Requirement through Stripe
Know Your Customer Obligations through Stripe
Date of birth and Social Security Number requirement for US Stripe accounts