App stops on startup after entering PIN. Can't create Disposable Virtual Card in web interface (possibly because no app auth due to app crashes? or maybe free versus premium tier, but can't tell because tier level isn't shown.) Can't use Revolut card from my Fitbit wallet to pay via NFC at SMRT gates in Singapore. Says NFC payments not permitted by issuer; no obvious setting to enable NFC payments. Not confidence-inspiring: for a company that requires trust in both their fidelity and ability.