How are you large sites dealing with Spam bots trying to register

[z3r0]

I've pretty but stopped all spambots at my site using Cloudflare by stopping registration of the worst offending counties using my mod and blocking registrations from datacenters that I've seen spam coming in from using CF firewall rules.

(http.request.uri.path contains "/register.php" and ip.geoip.asnum in {9009 8100 27411 20860 46562 60068 14061 7203 20473 29802 13739 63949 36351 62240 202422 40861 61317 43350})

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