* let people hold money into their Stripe account instead of transferring to a bank immediately
* let people transfer money from their Stripe balance to any other account's Stripe balance for free (PayPal charges a fee for "cross-border" transactions)
* make it possible for marketplaces to pay their workers through Stripe (PayPal and sometimes Payoneer are the only choices now). Workers can then withdraw to their bank accounts from Stripe balance, or use it to pay directly for other stuff on the web
* have a low commission for merchants, if not free, for payments of goods using Stripe balance