I see where you're coming from, but this actually wouldn't prevent botting. Here's why.
1) Almost all bots being used are verified accounts. Otherwise they wouldn't be able to do things like message and comment as only verified users can do that.
2) Bots can make bots that verify their email - there are even websites that do it for free.
As well, this would cause a problem. There are tons of really little kids who play this game who don't have an email. They won't be able to play.
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