People are missing the point. YouTube has changed their algorithm that promotes paid videos to their trending section. Usually it consisted of really popular videos with tons of likes and views, now garbage videos and paid videos go up that have very little views or attention.
This was a great way of getting small youtubers noticed and bigger channels would get most of their views from the trending section.
Now that section is just for people who pay YouTube the most money.
This is killing YouTube channels both big and small. Yes Pewdiepie probably partly did it for selfish reasons but who is YouTube going to take more notice of, a small channel with a few thousand followers or Pewdiepie?
He was obviously trying to get Youtubes attention, they stand to lose a lot of money if he deleted his channel, I believe he was doing it for all of YouTube not just himself.
But what do I know, it's easy to hate on a successful rich person.