I'd like CC0 better for this case. If anyone is looking for a repository with many CC0 icons (among other licenses), I recommend SvgRepo: https://www.svgrepo.com/
I'd like CC0 better for this case. If anyone is looking for a repository with many CC0 icons (among other licenses), I recommend SvgRepo: https://www.svgrepo.com/
Personally I like the license you're using.
Going over CC-BY-SA for those used to software licenses only: If I make a work which uses CC-BY-SA material I have to provide attribution. If I modify the emoji to suit my own purposes, I need to release these new emoji under CC-BY-SA, and attribution to the originals must be provided, they may not be kept proprietary.
Using it in a project is redistribution, modifying it is adaption.
There's a number of these types of sites, and I like to keep links to them all, for when I'm looking for inspiration or graphics.