I think Rob_P is half right about blendr dating app: volume without activity is meaningless, but the rest depends on the platform.
The thing people miss about blendr dating app is that the active pool is smaller than the claimed one.
My read on blendr dating app: big numbers nationally can mean nothing locally.
The share of profiles with real photos matters far more than the size of the database, at least in my experience with blendr dating app.
Cutting the profile down to three honest sentences made more difference to my blendr dating app results than switching platforms did.
If how the photo requirements behaves once you actually use blendr dating app is not there, I do not bother with blendr dating app at all.