Not sure what they’re addressing other than comment/post permanence. I don’t totally see how that’s a direct connection to privacy

This will be more or less the same with Kbin and inherent with federation.

No, tis a silly place

This is the case with every hosted service. It isn’t a choice, it is just how data storage works. Things are always saved on someone else’s machine. Or, in the case of federated systems like KBIN or Lemmy, many people’s machines.

Your data is open and accessible to all. That’s the entire point of federation. Nobody owns it.