Let me know if you disagree - but I think the comparison to unscrupulous VCs is limited to the title of the post(which, IMHO, is mis-titled). In reality, the post is about something else. I quote:
" I never say “no.” But I carefully qualify “yes.”"
A comparison would really be a VC saying - I will invest in your company if you give me 80% equity. Or Yes, I will invest if you hit 30% growth in profit for the next one month. That, to me, may be unfair in some cases, but doesn't sound unscrupulous.
I think pg meant the literal sense. Unscrupulous VCs will waste an entrepreneur's time by never saying no just in case the situation changes, but statistically hardly ever give a definitive yes.