alt Hacker NewsCustomers agree to this when they accept the terms of the app. This is also how a debit or savings account at any bank works. Both businesses have sophisticated models to determine how and when customers are likely to make withdrawals, and based on these models they lend out the money based on acceptable risk criteria.
Even if it is in the T&Cs, this one feels like it wouldn’t actually hold up?
Expecting people to read those for most simple sign ups is already a high baseline, and Starbucks is not technically a banks and offers no consumer protections (FSCS or other), so that feels knowingly misleading, even if the total balances held are small per customer.
IANAL, of course.