Scanners follow links but do not press buttons on the page, so they leave no vote. A repeated vote from the same voter is not counted twice; the person sees that their vote was already recorded. Without a personal voter code in the link, HawkOpen tells voters apart by their connection, so two people on the same office network may count as one voter.
For link clicks in ordinary emails, HawkOpen labels likely scanner clicks instead of counting them as people. Polls are part of the Business plan.