Should freelancers should repay fund if the clients' project fail?

[Btaliat]

The only time that freelancers should be thinking of paying back is when the tasks fail as a result of the freelancers. If not, there is nothing concerns the freelancers if the products fail. There are many factors that can be responsible for failure of the projects. However, if the tasks fail, the freelancers can deem it fit to repay if he feels the guilty that he's responsible for the failure of the freelancers' projects.