For some weird reason, I tried googling Spine Runtime for C2 today and saw this in the result.
I got excited for a minute there that finally, I see an update about a runtime for C2 after all this years!

It's understandable that a runtime for C2 will not be pursued. But it's still sad.
I also prefer C2 than C3.

I'm still hopeful that maybe one day will come and someone will make one. crosses fingers