I'm involved in the challenge with a minor char (aka someome not critical to the overall story).
I don't know what numbers were before but they're way down on last year when I was playing last. So much so that I'm really struggling to rank up to hero.
The one other character I know involved in the challenge (as my bio mentions them) I've also never seen online.
So... not going great so far from my perspective but I'm otherwise enjoying the char and don't plan on giving up any time soon.