Maybe not, but it could be. They don't give any information so there's no way to know what they're doing, so you can assume good intention, or bad, or neither, whichever you prefer. To me personally it stood out how they put up a very nice landing page, with very verbose text, and never once mention any examples of what they're doing with it.
An example use case here, an interactive world map with a slider that lets you see how it was updated through the years: https://mejrs.github.io/historical
There's nothing nefarious going on here, I promise you. It's just a community project that has the usual poor documentation.
[1] https://runescape.wiki/w/User:Manpaint55/T:CHD-main
[2] https://old.reddit.com/r/2007scape/comments/100m73e/how_the_...
> They contain all the various raw assets used in the game (e.g. maps, models, sounds) and the definitions of content like NPCs, Items, and scenery objects.