Every time I see a new proxy registration, I always block the whole host (all IP ranges that belong to that host) and block the email domain in case it's a spam/temporary domain. Currently have a nice list of nearly 80 million blocked IP addresses from hosts which provide hosting/VPN services and such.
I don't care about traffic from such hosts, I only need legitimate traffic from users with home connection ISP's and the search engine bots.
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