While I appreciate it as an irreplaceable tool for countering DDoS, its premise is antithetical to a reliable and open web IMO, and it suffers from the same lack of accessible, customer-facing support as other big tech players. Lazy examples from HN algolia search:

https://news.ycombinator.com/item?id=32912075 https://news.ycombinator.com/item?id=17750801 https://news.ycombinator.com/item?id=22109969 https://news.ycombinator.com/item?id=30764757 https://news.ycombinator.com/item?id=29839960 https://news.ycombinator.com/item?id=22406277 https://news.ycombinator.com/item?id=23897705 https://news.ycombinator.com/item?id=34639212

(Hypocrisy disclaimer: I have sites behind CloudFlare.)