I left them a long time ago, as I felt—and still do—like the internet was too dependent on them. None of my projects ever needed DDoS protection though, so I mostly used them for DNS and caching at the edge.

If I ever needed DDoS protection it'd be nice to know of alternatives, if anyone has any to recommend. My provider—Hetzner—provides protection to some degree, but I'm sure a big attack would lead to black-hole routing.