To have fair elections with a one person-one vote setup we need a way to regulate how often a person votes and thus we need a unique personal (albeit temporary) identifier. Normally this done through government issued IDs but I guess an email serves the same purpose if we dont need to be super strict... but the point is we would rely on an already existing system.

I doubt people in the community would be happy to share IDs, emails etc with a random internet person for the sake of voting.
To use online providers, I would still need to get everyones emails to register them.
Using the forum messaging system gets difficult for lots of voters as it means a lot of manual response collection.

Would a dedicated app provide any benefit? Would the open store be a way to ensure one phone - one vote anonymously? or would I still need to rely on emails etc?