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X (Twitter) is down in worldwide outage.
(htxt.co.za)
This is a most excellent place for technology news and articles.
The most illegal part of a DDoS is usually the hacking / exploiting of thousands or millions of devices to make them all request twitter.com
I'm not entirely sure what rules it would fall under if you somehow performed a DDoS using entirely your own hardware and Internet connections. It might even be legal, just against the ToS of basically every ISP. I'm pretty sure if Google or ChatGPT take down a site by sending too many crawlers there's no legal consequences.
There is also the Hug of Death, I don't think that's illegal