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At which point does high quality spam cease to be spam?

Might refer you to XKCD 810.

There is a XKCD for everything.

hmm, is there XKCD for "might refer you to XKCD $number" ?

The point where it is just misinformation?

Misinformation is false information. Spam can be facts.

Theoretically, yes. But better treat it as misinformation.