It is widely known that most AC-DC converters (aka "wall warts") continually use electricity, even when no devices are plugged in to them. That wasted energy is often called "phantom electricity" or "phantom use".
A new trend is USB (DC) outlets, whether integrated into the wall plate:
or attached to an existing AC receptacle:
Do both of these two new types of AC-DC converters waste energy just like the old wall warts?
If so, what is a reasonable solution?