I'm calling it here: the most useful data is private, or, can't be sold due to confidentiality. The fact that data is confidential is great evidence that we know it is useful, but also that we hope others won't use that signal.
ChainLink has an option to use Intel SGX along with TownCrier to provide trusted execution at the processor level. That ensures confidentiality without exposing the data at all.
Confidentiality is not an obstacle to using material data. As long as you can independently obtain it through unprivileged research, you're fine to use it, sell it or trade on it.
