I own one of the biggest game modding websites where I use link shorteners, you couldn’t get more clean traffic than mine, srtfly did pay for a while (one month) then they suddenly pended my payments when it reached considerable amount, no reply even when I sent them details about my traffic, to this day they never replied (two months now), my conclusion is that srtfly is definitely bad Shortener, greedy and thieves, I honestly recommend staying away and find a professional alternative.
I hope I did someone a favour, many of us work hard and deserve to work with honest people rather than getting robbed by people like srtfly
Good luck
I can give you a special treatment.