They claim to have a lot of info available if you sign up, but turns out they don’t actually have the info they claimed. Unsubscribe email address listed in their signup process isn’t even a valid email address. One can only assume that even if you did manage to get thru to them, they wouldn’t bother doing the job of unsubscribing you any better than they did at putting together a list of contact info.
UPDATE: As you can see below, the founder of Lead411 has commented with a certain level of explanation that certianly mollifies my inability-to-unsubscribe-related angst. I don’t remember the exact info I used to sign-up, to validate his comment about temporary restrictions on “fishy” accounts. Given that my corporate charter lapsed years ago, I could buy that as being marked “fishy”.
UPDATE2: I had further off-line discussion with Tom, and feel that his explanation for my trial-signup’s limitations was reasonable. More impressively, he immediately added a proper “abuse@” address to their mail system based on my suggestion.