The Gambling niche was hit hard as were the Health & Finance niches (though the update was/is impactful across the board).
Maybe this statement is correct. Because, one of my client is having some Gambling sites. Before the update, one of his site had the best ranks on the search engine. But now, those keywords are went down. At the same time, his another site has good improvements when I compared the before and current standing. Therefore, the June month update affected widely for every niche.
Before the update:
After the update: