Some websites being under ddos attack =/= all sites are under constant ddos attack, nor it cannot exist without it.
First there's a logic fallacy in there. Being used by does not mean it's useful. Many companies use AI for some task, does that make AI useful? Not.
The logic it's still there all anubis can do against ddos is raising a little the barrier before the site goes down. That's call mitigation not protection. If you are targeted for a ddos that mitigation is not going to do much, and your site is going down regardless.