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I think this too and am considering running a web crawler full time.

If enough people were willing to do this we could create a massive distributed index to rival google's.

Not that simple. Unless you get some prodigies involved in this, the government will be able to apply more math at filtering the noise that we'll be able to throw at generating it.

Just run a tor exit node. Problem solved, sort of.

Until you're being questioned in connection with child porn. I'm glad that tor exists but the crimes that some people commit with it make it impossible for me to run an exit node. There are things I don't even want to be remotely be associated with.