What makes a site hosting malware per se harmful, and how can you consider malware per se harmful while booters avoid being classified identically? Malware is illegal and obviously a detriment to the internet, as are booter services. Perhaps you're just willing to deal with malware so you don't end up in the same boat as No-IP did here.

Booter services are so incredibly common that the police aren't going waste their time on them, especially since once the cops get the real IP from your convenient obfuscation service, it's likely hosted in China, Russia, or some other country where no action will be taken.