The marginal cost of spam is orders of magnitude more if you have to pay humans, even very poor ones. In the arms race between spammers and operators and consumers of content, even fairly large/expensive fully-automated system capability is much scarier than even more robust semi-automated ones.
The marginal cost of spam is orders of magnitude more if you have to pay humans, even very poor ones. In the arms race between spammers and operators and consumers of content, even fairly large/expensive fully-automated system capability is much scarier than even more robust semi-automated ones.