DNSBL filter on the site (web script) - how reasonable is it to enable?

Question

PHP

Hi all.
Who thinks:
If you turn on the filter: if the IP is in the DNSBL, then the error is 400 (403, 404).
Is there any benefit? Who tried?
Thank you.

Answer 1

If you want to go to the site - then a rather stupid idea. It's easy to rattle in dnsbl, but they remove almost nothing from there.
If this is your blog with a traffic of 20 people - why not.