All successful online sellers own their own eCommerce store too. They do sell on other platforms but they never undervalue the importance of having their own business website.
So rather than relying completely on other platforms and following their rules, regulations, registration, and documentation process, you could do something very simple, much better, and in very less time.
You can start your own eCommerce website i.e. your online store to have complete control over your business and keep all profit to yourself. This is no longer a difficult process.