It did catch on, pretty much everything that supported RSS also supported Atom.
It's just that they both fell out of fashion when social media decided they prefer to keep their users captive than accepting interop.
It's just that they both fell out of fashion when social media decided they prefer to keep their users captive than accepting interop.
But many podcast clients actually still support Atom (probably using a feed library that supports various formats?) and basically all non-podcast feed readers support Atom.