At least with "blaming the proxy owners (such as google) for not cleaning up their mess quickly enough" I think tedivim is probably referring to: https://news.ycombinator.com/item?id=13721644
I saw that comment when it hit the original thread. I think commenters are conflating Project Zero with Google search cache in the usual version of this sentiment.
If I was Cloudflare, and someone had made me aware of this bug, I'd be griping as loudly as possible to get remaining caches cleared ASAP. It's all they really can do.
The fact that Bing had unlocated cached documents doesn't impact on Google search being quick or not to clear their own caches.
Did Cloudflare cause all this? Yes. Are they working in the interest of their customers to gripe at remaining cachers to refresh their caches? Also yes. Is there something else they could do now that we're here? I can't think of anything more effective.
