lol the pictures of them wearing it outside while listening to music; must be annoying the shit out of everyone around them because of the sound bleed.
Also using a 6.35 mm plug with a 3.5 mm adapter on a smartphone. Last time I did this with a smartphone and a Sennheiser 6.35 to 3.5 mm adapter, the phone jack got damaged due to the weight of the cable and adapter.
I think its a 3.5mm jack which has a 3.5mm to 6.35mm adapter (and they've got it wrong in the description). Because its the same with other HiFiman headphones, and I haven't seen any manufacturer providing a 6.35mm jack with a 1.5m cable.
I bet people could live with it. How is it any different than the dude who adds a sub to his car stereo and drives around whumping and rattling as loudly as possible except that it's more tasteful?
Don't forget that headphones do not put out much power or they'd deafen the wearer. As such, the sound they produce doesn't travel far. I listen to open cans in a shared cubicle constantly at work and never get any complaints from any of my cubies. I've even set the volume where it's comfortable for me to listen on the loud side taken them off and listened around my cubicle. I can hear it, but not much, and not at all outside my cubicle. And that's with the side that's actually designed to produce a sound open in a quite office environment.
Listening to open cans on a city street, would probably not earn the ire of anyone except the person using the open can because there's too much sound coming in to hear the music.