I've noticed that some users complain about the limitations of the free version. However, if you upload a valid photo of yourself, you'll receive additional messages even with the free account.
The FREE app itself is significantly superior to any other app out there. Moreover, for a very modest fee - about the price of a coffee per month - you unlock all features. It's worth considering, really.
When compared to apps like Grindr or Gaydar, which often lack user reviews or any means to filter out time wasters, this app stands out from the crowd in spades. The developers have taken a page from successful platforms like eBay Amazon by incorporating reviewer systems.
The free version is already excellent, and the cost for the full version is almost negligible for the value you get.
After all, you get what you pay for. If it is totally free then you become the product.