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i'm waiting for someone to write a bot that would ruin it for everyone

Easy enough - the bot would just open it as soon as it sees the email.

The prize amount would be too low to justify the time necessary to send the prize and would disincentivize anyone else from even bothering.

TBH, not even sure writing the bot is worth the time and effort.

When did that stop a troll?

I'm thinking a simple captcha would help with that.