Why can't I directly change the nameservers for my Blogspot blog to custom ones?

Blogspot is a managed platform provided by Google. When you create a blog on Blogspot, it resides on Google's extensive server infrastructure. Google manages all the underlying DNS settings and nameservers for its Blogspot service. As a user, you do not have direct access or control to change the nameservers associated with the Blogspot platform itself. Instead, you configure your *own* purchased domain's DNS records to point to Google's servers, allowing Google to serve your Blogspot content through your custom domain.