News that about ¥28 million has been stolen from bank accounts linked to an e-money service operated by NTT Docomo Inc., the nation’s largest mobile phone carrier, has made headlines in recent weeks, serving as a wake-up call for all concerned on the risks of e-money.

But it came as no surprise to cybersecurity experts who have long cautioned about such cyberspace scams, knowing hackers’ ploys are expected to get more and more sophisticated by the day.

Last week, online broker SBI Securities Co. announced that nearly ¥99 million had been stolen after six of its customers’ accounts were improperly breached.