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Is anyone actually auditing all these blockchains?

You wouldn't have to that's the whole point of the blockchain that the validation is done by the network itself.

All you need is to know which coin/token you are on and you know whether you have the original or not.

I think what he/she meant was the code base

Yes and thats missing the point.

Perhaps. How do you know who controls the hashrate?

An integrity verification service for [the codebase of] ICOs and other coins would be a welcome innovation