This is the wrong way to think about it. The optimization problem happens before a second person is directly involved at all.
The operator simply encourages behaviors which people _feel_ moves them closer to meeting someone but which are relatively time-inefficient. So the user has to spend much more time on the app, which increases all the relevant metrics of engagement and profit.
To fix the problem, one would expect an app which either charges a lifetime fee upfront or upon delivery.
Since it is hard to collect payment on delivery, the best case to eliminate the principal-agent problem would be a $2,499 one time fee for unlimited lifetime service.