Maybe they saw you coming. I just this minute subscribed to the mailing list by following the links to this URL: http://www.perl.org.il/mailman/listinfo/perl

You weren't doing something dumb like trying to log in as the list's administrator to view the subscriber list were you? The form states "The subscribers list is only available to the list administrator."

Perhaps you didn't understand that you're joining an emailing list, not a Monastery, by filling in that form.