Yes anyone that knows what they are doing can set there phone to fix this.It's not the electronics that make this difficult. It's the software. Anyone who's really concerned about this can just set the USB options on their phone to "charge only". In this mode the *phone* will prevent transfer of data over the USB channel. That said, most cell phones locked down for consumer use limit USB data transfer to media anyway, and I can't imagine why a company that sells phone chargers would want your vacation photos.
Of course, the other option is to buy a cell phone that has decent battery life and avoid the problem entirely. My BlackBerry Priv (runs Android) can easily get through a day of moderately heavy use on a single charge. No dead battery concerns, nothing extra to carry around.
However anyone who knows anything about internet security won't be dupped by a phishing email either and we know that those actually work quite often. I think there would be alot of people that wouldn't know to do this on their phone.
Also I would want to see one of these fuel rods to see how tamper resistant they are. I would trust a company not to gather data they haven't put a legal disclaimer that they are tracking in a terms of use (because the company would be stupid to do that when most wouldn't read the terms of use anyway).
However I don't trust that individuals wouldn't add a device to the fuel rod to collect this data for them. I mean people have been known to add card skimmers to vending machines and gas pumps. This wouldn't be that different.