Comment by Terr_

> Someone with an incentive to spam will always be able to do it faster, more efficiently than you.

Sure, but looking at the cost to do it at scale is the wrong metric. I surely can't compete with a career spammer on emails-per-second or even emails-per-dollar, but I also don't need to.

It's more about the expected-value versus the cost. For example, my expected benefit from one email to my family is (while hard to quantify) hopefully much higher than a spammer's expected benefit of one spam email going out, which has a very small chance of leading to any amount of money. Attaching a CPU-churn cost per email is something I can ignore on my desktop, but they have to at least budget for it.

I'd also like to note that the win-condition isn't as extreme as making spam (or other "crimes") truly unprofitable, it just needs to be less profitable than other things the time/resources could be used for.