For some (not me, I did not get hit in May) this was a reversal of May update. Niche: Sports.
Since I closely monitor this site as being part of my competition, I can say one or two words about it.
Negative aspects:
1. The site sucks at site speed. Not only the metrics are really bad, but the site goes offline when spikes of traffic occur - at least 3-4 times/week.
2. It is content rich, but it's not always the best or correct content. It's English only but the English they use could be better.
Positive aspects:
1. They get shitloads of nofollow or ******** links in exchange for providing data. Mostly nofollow. Link quality is mixed - can't go more natural than this.
2. Branded searches (exact domain name or long tail kws with the domain name) are around 5k/month. That's pretty good.
3. Strong internal linking.
Other aspects:
1. All content on the site is automatically generated, which means that thousands of pages might have 40-50% similar content.
2. They provide a service that may be useful for many people, therefore the branded searches.
3. Site is monetized via Adsense since the beginning.
Not sure if there's something to learn here, but even if this is a part of my competition (on many levels), I'm glad to see them growing. Their drop after the May update was a complete nonsense to me.