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I have seen this comment several times: it is possible to cancel these accounts with automatic tools such as the LoginToboggan module. But I have never seen anyone explain just how. When I go to the admin page for logintoboggan, it is simplistic and there is no setting to delete inactive or never-activated accounts.
What is implied by the name my_module_my_form_validate ? I think the question was specifically about adding validation to user information entered during registration. So .... shouldn't there not be a specific module name in there somewhere? This answer seems simple and clear, but there's not enough information here to make it useful.