I love this app. I am a teacher, not a math teacher I grant you, but a teacher none the less, and I love this app. It challenges what we think the purpose of math education is, where technology fits in that education, and how we should teach math.
There have always been ways for students to cheat. There will always be ways for them to cheat. This can be the latest, but it can also be a tool to help those who are afraid to ask for help. Or for those who just want to figure it out on their own. It can be a tool for parents to help their kids. It can be a lot of things, but first, it will scare most traditional math teachers.
Like Wikipedia scares some English teachers.