Why are they even still pushing that nonsense

It's a for-profit corporation. They only have one goal.

To be fair: snaps can work for all kinds of things all over the stack from the kernel to individual applications, while flatpak just does applications. Canonical is building a lot around those abilities to handle lower level things, so I guess it makes sense for them.

IMHO flatpak does the applications better and more reliably and those are what I personally care for, so I personally stay away from snaps.