That number matches what I am seeing on StatusGator: Of the 438 status pages we monitor, 52 of them are showing some kind of warn or down notice right now. That's almost 12%.

Though some of them might not be because of Cloudflare, the ones I spot checked all do appear related. Medium, DigitalOcean, Shopify, CodeShip, Pingdom, and many more. The impact is staggering.