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Trust me, its not smart to remove that.
There are a lot of bots on the internet searching for sites and forums to crash or spam.
If you dont have image verification some bots with register on your forum and make hundreds of spam topics to viagra sites and stuff like that. (and since they are bots they make those threads pretty fast...)
If you dont have image verification in search some bots with search a few hundred times a second to crash your server.
So, its smart to keep it.
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