Not sure how expensive this is to offer, but I would love if more wikis were encouraged to offer a bulk export option. Monthly db dumps or similar. I am sure many sites get wasteful spider traffic which could be avoided if the structured content were available. Maybe host them on Internet archive the way stack overflow did.

Also, if the exports were significantly better documented that Wikipedia”s. I could not make heads or tails of the hundreds of options Wikipedia presents, all seemingly without any unifying resource describing the differences.