Yup, some examples are service businesses to coordinate with users--(Rinse, Shyp, Handy etc.) Handy is even using it to register users for recurring cleaning service if they had a good experience. Delivery on demand companies are using it to allow opt out (Susie assumes you want a meal from them everyday unless you opt out of it.) Mayvenn's definitely the first to apply SMS to Ecommerce so well.