These bots were operated by humans. I tried many different captchas and that didn't stop attacks. In some parts of the world it is cheaper to get a human than t

These bots were operated by humans. I tried many different captchas and that didn't stop attacks. In some parts of the world it is cheaper to get a human than the IP address. If you block addresses they have access to, it suddenly becomes not profitable to spam, because the IPs you have to get are too expensive.