Curious, what do you think of Sellfy? It gives you email lists, and analytics. I'm currently building an e-commerce platform like Etsy, and tossing up some id

Curious, what do you think of Sellfy? It gives you email lists, and analytics. I'm currently building an e-commerce platform like Etsy, and tossing up some ideas of what kind of features to provide for sellers with respect to their brand, email list, and analytics, paywalled content etc.