What Max Price described matches my experience of sexting websites allow photo sharing almost exactly.
If you only test one thing on it, make it what the free ceiling looks like in practice.
Out of roughly 120 matches on sexting websites allow photo sharing, 5 turned into an actual conversation.
Provided how visible the block and report controls are holds up, the app is a reasonable place to start.
After a few weeks on that one the only question left was whether the algorithm is doing anything useful.