Build a risk policy. Not a wall.

A good policy has a purpose, an evidence threshold, and a way to recover when it is wrong. Start with one narrow use case rather than a universal block rule.

#Write down the decision.

Choose whether a match should trigger additional verification, manual review, monitoring, or a block. Keep uncertain signals separate from high-confidence evidence and document how a missing result is handled.

#Test the uncomfortable cases.

Try a shared household device, a workplace VPN, a legitimate private-browsing session, and a returning customer on a new phone. These cases make it easier to see when a broad rule would create unnecessary friction.

#Observe before you enforce.

Run the policy in monitoring mode and review outcomes. Track both abuse caught and legitimate activity disrupted. Changing a threshold without checking those tradeoffs is not the same as improving a policy.

#Keep a path back.

Give legitimate users a clear next step. An understandable verification flow or appeal process can matter as much as the detection itself.