Chinese billionaire Jack Ma was praised by President Donald Trump in January after the internet tycoon pledged to create American jobs by helping a million U.S. businesses sell goods on Alibaba Group Holding Ltd. ’s online shopping platforms in Asia.

Indiana artist Michel Keck says the platforms have been more hindrance than help.

Ms. Keck, whose work has been featured in TV shows, movies and department stores, never sold her mixed-media collages of dogs and abstract paintings on Alibaba’s platforms. But she says counterfeit copies are available on the company’s Taobao Marketplace for as little as 3% of the price of her authentic works.

Alibaba said it has removed hundreds of links reported by Ms. Keck. But more soon pop up, she said, sapping her time and creativity. “Why would a U.S. small- or medium-size business want to put their original creations, their entire livelihoods into the same arena where counterfeiters are ready to steal any original concept or idea?” she said.

Alibaba’s Taobao was reinstated on a list of notorious marketplaces for fakes in December due in part to “the challenges right holders experience in removing and preventing illicit sales and offers of such goods,” said the U.S. Trade Representative’s office, which maintains the list.