Warner Bros. has settled an FTC complaint accusing the company of paying YouTubers "hundreds to tens of thousands of dollars" to make positive review videos for Middle Earth: Shadow of Mordor. FTC filed the complaint back in 2014, after the studio ran an online marketing campaign for the game. According to the the commission, Warner Bros. required (PDF) the online influencers they hired to make a video that promote positive sentiment about Shadow of Mordor. That video should not show bugs or glitches that may exist and should not communicate negative sentiment about Warner Bros. These influencers also had to promote their videos on Facebook and Twitter. The commission didn't release a list of the YouTubers the studio paid, but it did name PewDiePie as one of them.
They had to save that money for the Batman game as Shadow of Mordor was a really good game anyway.
Edit: I have no idea why the quote is "strikethrough".. Weird.