Chachi has the advantage of polls being confined to a certain group where only the members can vote. Didn't need to modify the relays, NIP-29 relays already enforce not accepting events in the past or the future. Deletes are still supported by the relay but I don't think is a big deal. Chachi UI doesn't let you delete a vote after casting it.

> There are reasonable measures that can be taken to make it less scammy especially when results have real consequences (winners get rewards or something) . We've discussed this on the spec itself. 

+1, don't get all the bike shedding and resistance to implement these poll types, it's something that many users demand.