Being able to add trust and accuracy to search results is the major selling point for Kagi to the way I think.
Getting the integration with Wolfram was genius.
It makes it easier to return more accurate data and
easier to trust the data returned.
An integration with Encyclopædia Britannica would build upon this idea.
Kagi could return entries from premium Britannica (usually behind the pay wall) and Kagi users would be able to read the full articles that the hit returned.
I would love this feature and it would add another step in building trust and quality into the search engine.
A user would search for lets say "Albert Einstein", the search result would
have the same results it does today.
In addition it would link to the premium (behind paywall) Encyclopædia Britannica article that could be read by Kagi users.
Britannica has high quality articles that most people trust.