I'm beginning to get really suspicious of the term "caching". "caching" sits in naive users' heads as a benign performance improvement. And that positive glow is being abused to sneak things past the unsuspecting users.
There have been so many "I had no idea Primal does that..." notes the past few days. If the settings said "Content filtering and note-ordering server [cannot disable]" rather than "caching server", far fewer people would be using that client.