I have (had) a regular buyer, I worked on several projects with him researching topics (with cites and references). My gig is commercial research, we split the last proyect into several orders (3 orders). He asked for revisions in the first 2 orders (I gave him more than requested in order to keep him happy). After the last order was delivered, he ceased to comunicate. More than a weak later, I write him in order to check if he needed anything else. He said he was unhappy with the work, that he had used Turnintin and the text had a 19% similarity (literally the day before I write him), so he had to re-write some of the text in order to deliver his “thesis”., so, he wanted a refund. I asked him for the Turnintin report, and he said he couldn’t share it because the text was confidential. I offered him to work on the text I wrote and he didn’t have the time and he didn’t need any help at all.
I contacted Fiverr and they said I should work it with the buyer.
He contacted Fiverr support and asked for a refund.
I worked very hard, seems unfair to say the least.
By the way, according to Turnitin similarity doesn’t mean plagiarism, if properly referenced a text can (and should) be similar to other texts.