Context that some may be missing is that this was inspired by discussion surrounding the Open Heart Protocol submission: https://news.ycombinator.com/item?id=4

Context that some may be missing is that this was inspired by discussion surrounding the Open Heart Protocol submission: https://news.ycombinator.com/item?id=42791378 https://news.ycombinator.com/item?id=42791378 People immediately began discussing the applications for criminal use given the constraint that only emoji are accepted by the API. So for that use case the PUA wouldn't be an option, you have to encode it in the emoji.