How common are Instagram only shops in your area? Why do you think they are good / bad?

So in my country , I've noticed that a large number of small businesses operate fully as an e-store on Instagram App.

Without having to have a website of their own, entrepreneurs commonly use this platform to create shops where they sell a range of products from home-made goods to imported ones.

i am specifically talking about having established small businesses relying solely on Instagram for an E-store.

• In your local area / country, is this business model viable?
• How common are these business models in your local areas and region?
• Why is it a lousy business model? \Besides the obvious fact that if Instagram shuts down, so does the store*
• Why is it a good business model?

overall, i think its a quite interesting phenomenon. I would love to hear your input