I use this to stop all VPN spam, as I get around 200k uniques daily, after already blocking all the nasty stuff in Cloudflare, but VPN blocking in CF is expensive compared to this solution. Its blocking a VPN every 1.5 seconds, which is nearly all spammers and systems trying to circumvent existing blocks and measures. Highly recommend this for high traffic sites or anyone getting lots of VPN spam. An insignificant price monthly for proxycheck to work in conjunction compared to Cloudflare prices for easy VPN blocking.