Shopify does not want you to cancel. And it tries it really hard.

All online business owners know that is going to be easier to make a new sale from someone that has been already a customer in the past, rather than getting a new sale from a new customer. Shopify disables the cancellation button after several toggles & dropdowns within a pop­up just with the 2 clear purposes: a) Knowing why you really want to cancel (and if they can make something to keep you) b) Decreasing the options that you end up finding which combination of answers e nables the ‘close my store’ button.