Unfortunately these are the people who glue old clock gears across the lenses of their goggles (seen it!) which could account for a terrible accident rate with their steam-powered monowheels.
https://mashable.com/2015/03/22/monowheel/?europe=true
Frankly, I think it's amusing and mostly harmless. Just so long as the hipsters don't join in and clean out all the unmutilated vintage stuff. A few unloved AVOs with bulb holders stuck on top is OK, but every old AVO ditto would be a great shame.
David