As we all know, there are many patents in the areas of voice recognition, optical character recognition, face recognition, etc. Many of these same services are on the Mashape website provided as free/paid API services. I can't imagine all of these services are licensing the respective patents.
Do they think it is unlikely they'll be sued by patent owners? Or would it be too difficult to prove they are infringing on patents?
EDIT: I should point out that this scenario obviously isn't only going on with the API services of Mashape. It just works well as an example.