If you’re talking about customers in the UK, I believe PayPal is using direct debit to withdraw money from current accounts.
Right now Revolut offers current accounts via a third-party partnership, but features like direct debit and standing orders (and FSCS) appears to be tied with ‘full’ bank accounts (as dual-regulated by the FCA/PRA.).
It may come soon, however. The average length of time from the beginning of the procedure to the granting of a banking licence appears to takes around a year and a half to two years (At least from Atom Bank, Monzo and Starling’s experience.), so it will be a while.
SEPA direct debit however, appears to be on the way.