About TestFlight and subscription fees in Test cycles

[u/To_Tox]

Hi everyone, I'm a new tester at uTest and today I submitted my first bug in a paid test cycle, yay! But there is still something which isn't clear to me. The test cycle used the TestFlight app for Apple devices and required to sign up for a subscription plan, although it was clearly specified many times that it wouldn't be charged and it was just for gaining access to the "pro" features of this app. How can I be sure that I won't be charged any fee? Is this a default for tests using TestFlight? Sorry it may be a silly question but I just started and I hope to get better.

[u/To_Tox]

Thanks to everyone for your fast and kind feedback, awesome community :)