A TikTok ban wouldn’t put Carrie Deming’s bookstore out of business, she said, “but it would make paying the bills a lot harder.” 

Ms. Deming heads to TikTok daily, posting videos of book reviews and highlighting new titles at the store she owns, The Dog Eared Book in Palmyra, N.Y. People have stopped in from as far away as Norway to visit the store, and sales on the shop’s website have spiked, all thanks to the app, she said.