As it stands? Cloudflare is still incredibly effective at protecting customers from those DDOS attacks. Which, depending on your hosting solution, can mean very noticeable monetary savings because YOUR hardware/connection didn’t spike. And, regardless, can mean noticeable monetary savings as your engineers didn’t need to recover a crashed system because your setup was just sitting there idle.

That said: If you truly need high availability? You need to do what downdetector did and have alternatives ready in the event that Cloudflare falls over. Same as with your ISP… which should be ISPs plural.