Any open online poll admits it can be gamed, and most put their stronger anti-cheating behind a paid tier. PollMaker.ai includes captcha and duplicate-vote protection on the free tier, because a poll that can be trivially stuffed is not worth running.
The harder problem is not blocking bots. It is convincing a skeptic that the final number is real. A one-time Event Pass publishes a verifiable tally: every voter gets a receipt to confirm their own ballot counted, and anyone can recompute the whole count in their browser to confirm none were added, dropped, or reordered.
That is the piece missing from a plain straw poll: not a claim that it is fair, but a record anyone can independently check.
Voter addresses are hashed with a per-poll secret and discarded. Nothing traceable is kept, on any tier.