By giving users the tools to moderate their own content. If you're peering with an instance that seems to pass on a lot of bad/dangerous content, then block the instance. You can use public blocklists on your instance if you want, but it should be your choice.
Also, it should be noted that blocklists are not a solution for things like phishing. Things like MFA and WebAuthn are the solution.
Also, it should be noted that blocklists are not a solution for things like phishing. Things like MFA and WebAuthn are the solution.