Moved to Site Feedback and Help.
Fighting spam is an ongoing thing. We implement procedures on the back end, and spammers soon find a way around the blocks. It takes time to tweak things so we're not impacting valid users from accessing the site. Sure, we could go the nuclear route and ban an entire country, but that doesn't help those that are trying to log into ECF with valid needs.
You'll also notice that the spam gets cleaned up and doesn't last very long.