Comment by michaelt
Before CF, there were no DDOS for hire services, because they all DDOSed each other offline.
Keeping them online generates more DDOSes, driving demand for CF’s DDOS protection product. Protecting such sites is a sound business strategy.
DDoS protection stops their site from going offline, it doesn't stop them from advertising their services on some obscure forum, which seems to be what they used to do and still do today.