Tipping is not customary, nor is charging a service fee on top of the tip
The “It’s customary to leave a tip” page that comes up after your purchase needs to go. First of all, sellers are freelancers, and it is not customary to tip freelancers. So the statement “it’s customary to leave a tip” is untrue.
Secondly, the buyer already agreed on the price, and since it is not customary to tip freelancers, this page gives the sense of trying to “guilt” you into tipping. I would not have as much of an issue if a page simply came up asking “Do you wish to leave a tip?” Although I still think that is tacky, it would be better than the current wording.
As a freelancer myself, I never expect a tip b/c I set my own price, and I assume the reviews speak to my ability, so I charge what i feel I am worth. People express their appreciating by 1.) hiring me, and 2.) by thanking me, and 3.) sometimes by referring me. Finally, you’ll notice Fiverr conveniently assesses a “Service Fee” on the tip. So what this seems to be is just another way for Fiverr to make money by guilting you into paying more. Even when tips are customary, it is not customary for the employer to charge more on top of the tip! (Ex: At a restaurant, you pay taxes on the bill, and when you leave a tip, you do not pay additional taxes on the tip.) So Fiverr should either eliminate this page OR at the very least change the wording and do away with the service fee.