Earlier quoted context omitted.
https://www.netlify.com/security/ sez “Active DDoS mitigation — Netlify monitors for traffic pattern anomalies and spikes, and effectively controls for them as needed” and now I'm curious about what that actually means .
It means they protect themselves from layer 3 and 4 DDoS. For layer 7 you're mostly on your own. That's what most companies mean when they talk about DDoS anyway.
“The cool thing is that we also provide a load balancer, and if our system has detected that our main load balancer is currently being hit by a large DDoS attack and is slow or unresponsive, we’ll simply route around that on the DNS level. Since we cache content at our edge nodes around the world, end users also experience extremely fast page load times because of this.”