This is no use. The second you receive an image you can screenshot... I bet the best practice is to be sure one really wants to send that picture. And obviously be confident enough to be able to handle those things you mentioned. In general, on the internet, you lose any control on what you let out of your phone, computer... So if you are afraid of anything the advice is: no sharing. IMO.

Everyone should be allowed to unsend any and all photos that are exchanged between the two Grindr party's do to safty concerns for each individual. People tend to save or screenshot other people photos with the intent to threaten, stock, harass, post derogatory comments attached to ones photo, and to share negative thoughts and feelings about a person to others in hopes of bringing the grindr community together for support to attack said person. Please it's a safety concern for people and it puts lives are in jeopardy