We couldn’t find a thing about account deletion, but that’s probably because Gravatar is part of WordPress these days. If you have a WordPress account, you have a Gravatar account. It’s the same thing. Since WordPress is blacklisted, Gravatar will need to be blacklisted too unfortunately.
Please note that AccountKiller.com is not associated with the business listed on this page. AccountKiller provides easy-to-understand instructions and guides on how to cancel charges and relationships from the list of businesses on our site, we have no affiliation with these businesses.