Prolific doesn't have a way to report survey providers. There's also no review sites to warn about bad providers. 5% of my earnings have been lost due to unsubstantiated rejections out of 111 surveys done for Prolific. Prolific says they want to figure out a way to report bad survey providers, however they have little incentive to remove providers who give unwarranted rejections to a minority of participants. Prolific is still getting commission on these bad providers and it would get none if they removed them, so I don't think they're in a hurry to add functionality to remove such providers. https://support.prolific.ac/article/55-my-work-was-rejected-what-can-i-do Given that there's no way to report providers, there's no review sites to find bad providers before doing the surveys, and it seems Prolific has little motivation to remove bad providers, what can be done to protect participants when using the Prolific platform?