There is two goals here: the first is to ensure the dating pool is relatively unbiased towards one sex (I call this Tinder's "sea of dicks" problem), as well as creating a bit of implicit social validation (this person is on the app essentially because they had a friend of the opposite sex who was willing to vouch for them) and then the other is trying to attack the problem of overly-polished conversation: people who are charming via text when they have a moment to think of a response, and decidedly less clever when speaking in person (this is something I'd like to change about myself, personally.) But the advantage here is that this is true for a lot of people, and puts some humanity back into meeting people online.