By the way, if there WAS a centralized spam filtration somewhere, as you seem to be proposing, there would still be "a giant" snooping everyone's mail. Or did you not realize that.
hammock, blueplastic didn't say to centralize spam filtration. He said to make messages cost money, thus making spamming unprofitable. This is totally different from the machine-learned-model-reads-all-my-mail situation that we have now AND totally different from a centralized Big Brother antispam agency.