I think it would very useful to implement a feature in order to verify the identity of a Grindr User in order to ensure that the profile photos are not fake. For example let's consider this scenario.
1) I have some face pics on my Grindr profile.
2) I want to have something on my profile who demonstrates that my face pics are not fake.
3) I use some tool that asks me to open my camera and to put my face on a frame in order to record data of my face.
4) This tool will use some images processing algorithms that controls if my face matches with my profile photos.
5) If constraint #4 is not violated Grindr App will put on my profile some logo who demonstrates that my profile is verified.
This functionality should be free, since data protection is a fundamental right.