Does nobody use portable digital music players like the iPod or Walkman anymore?

I bought one a couple of years ago as a gift, a Sony Walkman, and it never got gifted (a whole other story), so in cleaning things out I found it, brand new in its box.

Originally I bought it for a little over $400 and put it out on local social media for sale at $125. Not a single person was interested, didn't even gat a lowball offer.

I'm thinking I'll end up giving it away... how can something go obsolete so fast? Is it because of smartphones?