Reasons for brands to create mobile apps

If you observe and think about it then you will notice quite clearly that there are many brands that are actually creating mobile apps for their businesses. Now, why do you think it is like this? Let’s take amazon for example, if you build an app like amazon and provide access to people to all your products and services through their smartphones and help them with ease of access then the chances of more people being attracted towards the brand are higher. What other theories and reasons might be behind the fact that brands are creating mobile apps?
https://createapplike.com/how-to-make-an-app-like-amazon/