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Please don't make blocking VPNs plan A. Between snooping ISPs and public wifi networks that have indiscriminate content filters, I'm on a VPN about half the time. Many other legitimate users are as well.

Yup, in adtech, "IP is an AWS block" was a bot 99.999% of the time.

The 0.001% was that person using EC2 as a proxy or VPN server.

It's not only AWS. Also happens on Azure and GCP.

True, but at the time, 3 - 4 years ago, Azure and GCP IPs were minimal.

Guess the fraudsters were vendor locked lol.

> block signups/comments from known throwaway email domains

Throwaway email services have caught up to the point where even bigger players don't manage to block them, i.e. they rotate the domains used for the emails.

But then you end up forcing people to use Gmail.