My rule for onlinebootycall.com site now is simple: check how transparent the enforcement is on day one.
About 120 profiles into that one, the pattern around whether the active count matches the claimed count became obvious.
Given how whether the recommendations improve with use behaves, I would only recommend the app to someone with patience.
The measure I would actually check on it's whether the recommendations improve with use.
Your mileage on onlinebootycall.com site will vary by city more than by anything else.