Man, if Amazon had one bit of the drive toward ethical standards for work that Prolific has it would be amazing. Every problem I have encountered during tasks on Prolific have been answered by one of the site creators and usually quite promptly. A few days ago I contacted them about some work I had done after initially being unable to complete the work because of some errors on the server side of the requester. I gave it a few weeks after several attempts to contact the requester then submitted a ticket to Prolific. I just received a direct payment from Prolific itself for the value of a task that had expired due to the fault of the requester.