Technically it seems nice, but what's up with reusing the "high voltage" symbol for this? And "thunderbolt" is a very tacky name...
There is no kludgery involved when plugging USB cables into Ethernet ports. They just fit perfectly.
Sure, this very second, there's going to be no confusion between the two symbols, but if this catches on and the symbol becomes ubiquitous, it will muddy the discrimination of the safety logo.
This is simply irresponsible behaviour from a tech giant who intends for this symbol to become ubiquitous. All in the name of "oo, it looks cool!". Bad Apple!