One of the first things I did on my Steam Deck was to get Winamp running via Bottles :) it lives on the inbuilt screen when I’ve got it docked in desktop mode on my 2 desktop monitors.

Audacious with a Winamp skin is close enough that it has replaced the need to have Winamp proper on my Linux workstations. Mostly because I want MPRIS integration, but also because I just can't be bothered to setup WINE or Crossover these days.

If you're in Windows you should check out Tray Player https://www.trayplayer.com/

No mention in the page if it's compatible with Winamp skins?

Same! Winamp was hugely popular in the post Soviet countries, like Ukraine where I grew up. And now, like you, I stream di.fm through it.