Jenny, your domain doesn't cost anything because it's a substack domain. Jen is using her own domains (they don't have .substack in them), which you have to purchase the rights to use. So it's free to have two substacks, but not to use your own domains.
Jenny, your domain doesn't cost anything because it's a substack domain. Jen is using her own domains (they don't have .substack in them), which you have to purchase the rights to use. So it's free to have two substacks, but not to use your own domains.