Gambling banner on a blog?

If you mean a self-hosted WP site (i.e. you have a hosting service someplace) — WP has zero control over what you put on your site. If you mean a WordPress.COM site, you’d have to ask on their forums:

https://en.support.wordpress.com/com-vs-org/

Hi, yes I meant WordPress.com. That was the answer I wanted to see!.

Thanks for the reply.