Ask How do freelance platforms handle it when a client requests changes that go beyond the original agreement?

[Edward22]

Most freelancers have been in a situation where a client keeps asking for more after the job was supposed to be done. It starts with a small request and gradually becomes something that looks nothing like the original brief. At some point, the extra work goes beyond what the payment covers. I am curious whether platforms have a clear process for handling this or if they just leave it up to the freelancer and client to sort out between themselves. What kind of support do platforms actually offer when scope becomes a problem?