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GoCentral is GoDaddy's web builder application that is a web builder and hosting all in one and is not transferable to other hosting platforms. It is not a matter of a free trial or not. The application is GoDaddy's and therefore is offered on their platform.
There is no way to export a site you create on the GC application to another host because the other host doesn't have GoCentral.
Now if you create sites on GoDaddy's Linux hosting or WordPress, you can most certainly export/transfer those sites to another host because they are not built on the GoCentral application.