That's a great anti-sybil protection.
Discussion
Fair point but it feels exclusionary to have it. Not everyone on Nostr is interested in crypto so it feels like somewhat of a turn off to new users. Seems better to have Zaps as more of a tip-like feature in polls.
Maybe they can pay it with Strike using credit card?
Maybe there could be zap-less polls but given how trivial it is to spoof them they provide little value.