This is farking great! It needs some usability fixes but what I really want to know is... WHY AREN'T THEY CHARGING ME to make tests!?!??! Don't give this away

This is farking great! It needs some usability fixes but what I really want to know is... WHY AREN'T THEY CHARGING ME to make tests!?!??! Don't give this away for free! Maybe I could earn credits by taking tests, but please, make some money on this! I guess they need lots of tests to make it work... but they should offer pro level features? Say, you get 5 feedbacks for free, all of them on subscription. You could also pay per test for all reasults. This could be a low maintenance gold mine.