A bank would be useful for general learning. i.e. when I went to the site just now, I didn't have a specific emoji that I needed to identify, but if there had been a 'bank of emojis' I probably would have wasted a few minutes of my day reading about what they mean...because I frequently have no idea what emojis mean...
And by wasted I mean I wouldn't have been working. Not a jab at your project :)