Who created the mobile app from my-apps.com?

Question

Mobile development

my-apps.com is a paid builder, as I understand it, someone worked with it, what are the pitfalls, is it worth contacting?
Another question is: there they have a monthly payment of various sizes. Let's say I paid for a month, created an application, posted it in stores, can I not pay for the next month? Or do you have to pay later for the entire life of the application?
The same question on app-global.ru