As someone who is regularly blocked by CF and G - no, they are not. Even worse, they should not be, because that would mean the complete end of privacy online (not that we are far from that). Anubis works because at scale it wastes bots' resources (time mainly).
I think you’re confusing bots that crawl a website with bots used to launch DDoS attacks.
it works because the global ddos adversary doesn't run javascript