Ecommerce is definitely a profit-making industry because people are loving the culture of online shopping and it is here to stay and it's gonna go nowhere.
In fact according to Statista, by 2022 there are gonna be 300 million online shoppers in the USA alone.
Going by that fact, you need to assume that ecommerce will always be in a boom. But there will be competition in the space as it is the trend and this should tell you that there is money to made here.