Also worth noting that the article specifically mentions how owners of ASNs can subscribe to CloudFlare at no charge to get notified when devices on their network are participating in attacks like this.
a funny thing happens when you decide to operate a DDoS-for-hire Web service: Your service becomes the target of attacks from competing DDoS-for-hire services. Hence, a majority of these services have chosen to avail themselves of Cloudflare’s free content distribution service
I think by treating the symptom they end up making it so that people don't actually do anything of substance in response to these absolutely massive attacks. Just put your site behind Cloudflare, obviously. Problems solved. Why do we need to do anything else?
Also worth noting that the article specifically mentions how owners of ASNs can subscribe to CloudFlare at no charge to get notified when devices on their network are participating in attacks like this.