The document provides specific examples a couple paragraphs after that statement: https://www.ietf.org/archive/id/draft-ietf-ohai-ohttp-01.html#section-3.1-5 h

The document provides specific examples a couple paragraphs after that statement: https://www.ietf.org/archive/id/draft-ietf-ohai-ohttp-01.html#section-3.1-5 https://www.ietf.org/archive/id/draft-ietf-ohai-ohttp-01.htm... > Examples of where preventing the linking of requests might justify these costs include: > - DNS queries. DNS queries made to a recursive resolver reveal information about the requester, particularly if linked to other queries. > - Telemetry submission. Applications that submit reports about their usage to their developers might use oblivious HTTP for some types of moderately sensitive data.