Here's the deal:
Google Maps currently doesn't work well in South Korea. That's because the SK government has refused to give Google access to their official map data, because of "security concerns". They apparently had no problem giving map data to local SK companies, however, so essentially those companies had an unfair advantage.
While negotiating tariffs, it seems like Google was able to slip into the talks and cut a deal with the SK government to get the data. I guess a minor detail of the deal is that certain things will be blurred? I assume military bases?