Usertesting doesn't work

How do you make money on usertesting if the app doesn't work--and hasnt--for a year? Unless you're a seasoned usertesting user, any newcomers (I assume) are unable to join. Or is there simply just a way to do it without the app or what? Check the Google store recent reviews, about 99% of them are repeatedly complaining that the app doesn't work.

I've been trying to get into usertesting for a year now. Either I'm missing something, or it's impossible to do on mobile.