Awwww, it's so cute when they get all bought out like that.

I wish Nintendo did stuff like that...you know...show affection towards their fans. Miyamoto and Iwata were the closest thing to it. Good move Sony.

Nintendo does. 

https://www.youtube.com/watch?v=1eETWaVlFM8

Pewdiepie is just a bigger name and he is the guy the media goes to when it's a slow news week. 

Behind closed doors she gives him the best cake.

I ain't seeing no cake. 

Pewdiepie: i love $$$ even more now

Yeah except he's also said he loves Xbox and Nintendo, so...

Well, that's actually a tuna pie, not a cake 

He plays a lot of Sony exclusives, he says he likes games with stories and doesn't like shooters. He's played Ni No Kuni, Heavy Rain, Beyond Two Souls, Journey, Until Dawn, inFamous, Shadow of the Colossus, The Last of Us, PT, Siren, and probably a lot more.
Also, Sony didn't pay him to play these games lol. He just plays games he enjoys. He also clearly states which games are sponsored. He's just a fan of PlayStation exclusives because those types of games appeal to him. He's pretty much free advertisement for Sony.

I'm pretty sure these youtubers and journalist get plenty of stuff from publishers for good will and for helping them market stuff. This is different from actually paying them, and also intentionally say good things about the product eg Xbox - Machinima Incident. In this ,they can actually say bad things about them.