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Insecure people would download this app, and prematurely 'cancel' all their plans so that they get notifications the moment anyone uses it. This app idea only works with the pretense of privacy until both parties agree, but it is open to manipulation. And once you know that manipulative people are misusing the app, you will police your usage of it, and then we're back to square one, where people are unwilling to communicate.
Yes, same thing happened with mojoupgrade. It's a questionnaire of sex stuff. You and your partner both fill it in. Then you'd see a list of all the stuff you both wanted to try. If either said "no" on anything, the other would be none the wiser. It was often abused (mostly by women) who would answer "yes" to everything so they could see the answers of their partner and give them grief about their wants.
Holyfuck talk about betrayal
In all honesty, I would probably be one of those people because I hate the idea of someone hanging out with me just because they are obligated to.