Adding a counterpoint about whether the useful settings are buried.
If you only test one thing on truly free dating apps, make it whether enforcement is consistent or random.
My first week on the app looked promising; by the second I was only really watching whether you can hold a conversation without paying.
If you're only browsing, it's fine. The moment whether it thins out after the first week matters, it changes.
Your mileage on truly free dating apps will vary by city more than by anything else.