No, but when you bring a charge adapter for normal electric, there's no risk. Whereas as USB gets more universal, you're less likely to bring your own charger,

No, but when you bring a charge adapter for normal electric, there's no risk. Whereas as USB gets more universal, you're less likely to bring your own charger, or even your own cable, opening up attack vectors. There's probably no mass-appeal way to satisfy both goals.