Yes, pre-built Shopify stores are legitimate. These stores are created by experienced developers and designers who specialize in building Shopify websites. They offer a range of professionally designed templates and themes that can be customized to fit the needs of different businesses. Pre-built Shopify stores provide a convenient and efficient way for entrepreneurs to start their online businesses without the need for extensive technical knowledge or coding skills. However, it is important to research and choose a reputable provider to ensure the quality and security of the pre-built store.