True, the "computer interface" obviously needs to be standardized, however backend functionality such as data retention policy, spam handling, etc, these kinds of tapestry need to be documented and communicated to the client operator so they can make an educated decision about whether they want to use the relay. Today this is done with a webpage, and maybe just a link to a webpage is enough, but it could be standardized how to get to this information through the relay list. Another standard could involve linking through to your npub's "public dashboard" on the relay where you can change settings and check the status of your subscription