You could add a CAPTCHA to suspect client IPs? You could implement some sort of real-time log analysis / monitoring based on client IP, x-forward-for (?) headers and User Agent, also possibly block certain geo-IP ranges…
You could add a CAPTCHA to suspect client IPs? You could implement some sort of real-time log analysis / monitoring based on client IP, x-forward-for (?) headers and User Agent, also possibly block certain geo-IP ranges…