That’s why instagram is full of travel pictures not of “I bought a house/car/etc” pictures. Us millenials don’t see possessions as a status symbol anymore but almost as a liability.
also the "stuff we never use" is probably mostly just parents fed up with their kids breaking stuff just by looking at it and they'd like to emerge from parenthood with at least some sentimental items still intact. (source: a parent with 7 and 2 y/o energetic, clumsy boys who I'd very much love to share my own personal memories with lest they be destroyed on contact with one of the whirlwinds of destruction...)
I hope it spreads quickly. I think it will help a lot of people who own too much stuff, and find themselves exhausted due to it.