Apparently that's not a good strategy: their 509952 IPs are blocked by
uceprotect, too; 217 of these IPs (again 0.05%) sent spam in the last
seven days. And indeed what you suggest is not a solution for the
WordPress site of a honest customer that get hacked, for instance.
You keep bringing up wordpress, a web application.
It's just an example, because it's a common web application with (too
many) security vulnerabilities.
There is nothing being listed by uceprotect that would prohibit a honest
(or even dishonest) customer from running a wordpress site. Sending
email from a wordpress site is much easier to do through a MX provider
than to self host, so why are you even advocating for self hosted
wordpress sites to host their own email?
I'm not advocating anything, and that's again orthogonal to the point at
hand. The point is that when a website gets hacked and starts to send
spam, all other IPs of the server provider get flagged.
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