There are a lot of instances where the Enterprise crew wanted to do the ethical thing, and Picard stops it or tries to. For example, when Dr. Crusher wanted to help when that planet population was addicted to drugs, and Picard wouldn’t let her do that or communicate anything to them.
Also, Data once found humans frozen in space, and when he helped them, Picard was annoyed; it wasn’t even a Prime Directive issue!
These kind of apps should be flat rate, else the incentive is for the best matches to be hidden, waste their time, or otherwise keep people lonely so they pay for more months.