This is thing some of us more experienced Sellers are very much trying to change.
This isn’t entirely a Fiverr thing as it is a weakness of humans that creates the situations that allows these things to happen. Laziness (greed) is the cause and an issue on both sides of the equation. The more buyers want Ferraris for $5, the more poor quality sellers will get into finding ways to play that game.
Again, quality sellers hate that and wish Fiverr could be more active in being “hammer of the gods” on it but they can’t/won’t. So we have to try to adjust the other side which is talking to buyers who think that they will really get a “perfect” Ferrari for $5 as they not only lead themselves into frustration but give everyone a bad name as they encourage the sorts of operators you have encountered. What I call garbage merchants.
There are good people here, like anything you have to know how to find them. If we could just remove the garbage it would be easier as people who promise one thing (usually using images they stole) and delivers another are a cancer.
Better people will tend to show work that is more unique, less formulaic as this is usually real client work.