Haven't watched this specific video, but from what I've read previously he's suing so that the courts can determine who owns the land so he can fairly pay them. Many people own tiny slices of land that they don't have any practical use for (because of how Hawaiian land gets passed down through generations), and Mark owns the vast majority of the island, so he's trying to fairly compensate the remaining land owners.
Also, he apparently dropped the lawsuit after the uproar.
Also, he apparently dropped the lawsuit after the uproar.
https://www.usatoday.com/story/tech/news/2017/01/27/zuckerbe...