I feel you, I am a graphic designer myself. I know of the ridiculuss situation. A friend of mine (a german illustrator) was notfiied some day that a few of her works where printed on pillow cases somewhere in china. Sold on the streets of shanghai.You can do nothing about it.
I dont know about fiverr.com but similar sites from germany. They have modular system with logo parts and put them together in 5- 10 mins. At least some of them. But they are sold mostly at 30 - 100 Euros not 5 dollar. :D
You can't fight piracy without a massive legal budget. Even then its futile if the pirat operates from somewhere remote and most artists I know don't even have the money to send a cease and desist letter.
If you see a copyright violation of your stuff you can inform websites like etsy and others to take the them down. But it is your obligation as copyright holder. Not that of the website owner(differs from country to country of course).
Glad I could be of help. I will follow you.