Yes, foreign companies that sell digital products via a US sales platform may be subject to certain taxes in the United States. The tax implications depend on various factors, including the type of products sold, the nature of the business, and the presence of a tax treaty between the foreign company's home country and the United States.

It would depend on a multitude factors. How the business is registered to conduct business in the USA, the state where the sale takes place for the product. Many platforms are set up to help sellers and buyers with part of the sales tax, if applicable. Income tax could be another consideration, depending on how and where the state is established. I hope this helps with the considerations to keep in mind.