I’m debating with myself, after reading this thread. I’d certainly prefer a more subtle approach.
However, I’m thinking that it might be better for all of us when Fiverr rigorously tells all sellers to not ask for neither review nor tip and takes over that part themselves in a corporate (and easy to ignore) way than what some sellers most obviously practice/d. I’ve been asked for a tip as a buyer before, it ain’t pretty, and I think buyers are more bound to leave or not leave a review or tip out of their own free will when asked in that corporate (click “no thanks” or “tip now” way) than when having sellers ask, or beg, for it.
To clarify, what I mean is that if buyers are annoyed by the asking for reviews/tips practice some sellers don’t see any issues with, they might leave, which would be caused by the sellers who do that but would hurt all sellers, including those who’d not ask.
But yes, in either case, that form would be much more to my liking without the “customary” bit, agreed.