Hi, I just fell prey to the Fiverr Milestone system, here's what happened:
I ordered an animated video. The seller was friendly and trustworthy at first and informed me that this is a pretty elaborate project so he divided it into two milestones. He sent me 5 character images for me to approve of as part of the first milestone. I accepted it and paid the first amount of money. I later was informed by Fiverr support that I've had 14 days after paying the 1st milestone to complain about this and get my money back.
But why would I? Everything seemed to run smoothly until there.
But from that point on the seller ignored my messages missed three (!!) deadlines and had no intention to work on the video knowing that I won't get a refund for my first payment and that the money is his. I waited three months and finally cancelled.
As said, the seller seemed professional and trustworthy at first so I had absolutely no reason to believe within the 14 day "period of grace" when I would have been able to cancel, that he was just after the 1st milestone payment and that he would stop working from now on.
So, after all I paid a few hundred euros for 5 simple character images that I could have done in seconds with an AI app.
Super frustrating and all I got from Fiverr support was a third of the lost money in credits that I can only use on Fiverr.