Boom boxes have made a comeback. Some phones are pretty loud. You can buy a lightweight sound amplifier to add to a phone. People use these hiking, running, biking, at picnics, etc.
I understand at a picnic... I don’t understand people by themselves wanting to project on to others their music choices after they’ve become adults. As a teenager I understand why we might have done that, but not grown adults.
I've come across lots of hikers and trail runners doing this, usually small groups of HS students. It's not really a big deal because they pass by in a matter of seconds, or you can let them pass you if they're going the same way. In some ways it's safer to use ambient audio on the trail rather than headphones.
