Spammers make money off of volume. The more expensive it is to deploy each individual spam, the less money spammers make. Processing and running javascript, retrieving and inlining external CSS, and rendering HTML all take time. Writing custom bots also takes time.
I think the goal is to make spammers lose the arms race simply because the payoff has become too small. If we can do that without CAPTCHAs, so much the better.
I think the goal is to make spammers lose the arms race simply because the payoff has become too small. If we can do that without CAPTCHAs, so much the better.