If you are in a position where you need to sue someone for breaking confidentiality, having a three dollar document backing you up is probably not a good idea... legalese is legalese for a reason-- because it's concise and reduces possible alternate interpretations.
Does it really look like spam? Why? Several "startup types" have already found it useful, and at $3, you can hardly lose. To get a lawyer to write you something similar might cost you $300.
I posted it because I honestly thought it might be of interest, and useful, to startup founders.
It wouldn't be spam if it was properly advertised. A title that said "Plain English legal NDA for just $3" would have been fine. However, when an article is linked to, unless noted otherwise in the title, I expect to see content.