It's tough to find any wrong doing by Google in an article like this. It's pure speculation. Many of their tools, step on other sites toes. Hipmunk and kayak recently had to deal with https://www.google.com/flights/.
When searching for goods such as "macbook pro" you'll notice sponsored links with prices that Google "may be compensated from". That type of stuff seems unfair to me.
I won't say Google is playing unfair as of late, but they are certainly more than just displaying results these days.