The CEO publicly broke their policy on this on two occasions: the neo-Nazi website The Daily Stormer, and 8chan. In each case, only after a long saga played out.
For The Daily Stormer: after they mocked the deceased victim of the Charlottesville rally, Cloudflare received public pressure to boot them but refused, and then the owner subsequently tried to troll them/the public by claiming Cloudflare executives secretly supported their ideology, causing them to finally be removed. (https://blog.cloudflare.com/why-we-terminated-daily-stormer/ )
For 8chan: Cloudflare received a lot of heat for not removing them after the first and second incidents of posters becoming mass shooters, eventually removing them after the third mass shooting. (https://blog.cloudflare.com/terminating-service-for-8chan/)
I forget the term/aphorism for this (like "double-bind", sort of), but they put themselves in an awkward position because they're probably one of the most neutral service providers out there - still far more than probably anyone else to this day - but by marketing themselves as 100% neutral, being only 99.99999% neutral created lots of lasting negative PR that people still regularly bring up.
Any other company would've kicked those people off way sooner and there would've been little to no publicity, because they routinely do such things, but now Cloudflare is hated by both the pro-censorship and the anti-censorship crowd. (See: https://en.wikipedia.org/wiki/Cloudflare#Mass_Shootings and everything below. It's quite a rollercoaster.)
They are known for protecting DDoS-for-hire and Cryptolocker services.
Anything that's actively serving malware or phishing pages is removed.
- no longer a dumb pipe, no longer neutral, actually active in directing law enforcement to take you down and possibly take people out.
Link to relative info is posted on another comment (https://news.ycombinator.com/item?id=27884821) - but for those who have not read it, here is an excerpt from a 2019 cloudflare post/statement:
"...what we have done to try and solve the Internet’s deeper problem is engage with law enforcement and civil society organizations to try and find solutions. Among other things, that resulted in us cooperating around monitoring potential hate sites on our network and notifying law enforcement when there was content that contained..."
So I stand by the statement, I can't see any other way to read it.
https://blog.cloudflare.com/why-we-terminated-daily-stormer/
funny how fast things can change.
I believe many of cloudflare's early customers especially felt protected and safe because of the stances - and I bet most don't know about the 180..
I also think most average web people would think if you set 'whatever' for your DNS - that the dns routing is basically a dumb pipe - it's not spying on you and sending copies of your data to gun agencies.
Just as I think most people would not expect their cell phone company or internet provider to spy on data and send snippets of your communications to agents. I would not expect my web server co to deep packet inspect all comms looking for bad things. (not without a warrant and being directed to look at a specific line, now a whole data center / cell co, etc.)
I think it was a terrible choice to make for cloudflare, but I know not an easy one either way.
So 'pipe' is a term that has been used in this way for a while now in similar fashion I thought - and it's not meant literally like a copper water line.
Also in some ways cloudflare has been a pipe - a pipe for flowing data that would be choked by ddos attack if were to try to send/receive across the net in most other ways kinda of.