I’m not sure if this is an obvious tip but, when you receive an order for a voice over, and you suspect this person is going to use your recording for his own service he is offering on Fiverr, be sure to check out his live portfolio on his gig page.
Yesterday I browsed the live portfolio of a buyer that ordered a voice over from me, without commercial rights, and I discovered my own voice over between his completed orders. The buyer pasted my voice under his white board animation. All fine, but he didn’t buy the commercial rights.
It’s not the end of the world of course, but it’s a matter of principle for me. We are all honest sellers on Fiverr (at least that’s what I like to think), so treat each other with respect.