Well yeah, did you expect that he hacked Google to take control of his account? Don't underestimate something so simple. It probably takes him months of investigation before he can find enough information to get someone's account. The reason it happened to Joel is because he wasn't careful enough. If Pewdiepie was as careless it would've happened to him by now, being basically the number one target on YouTube for this kind of stuff.
Of course it wasn't going to be easy, I will agree with the fact that he should of been more careful about the stuff he put out though, and it wouldn't have hurt him to use two step authentication.
Now someone like pew probably takes more precautions and considering he's owned by Disney (Contract wise) I'm sure that if anything happens to him it gets fixed in a second.
Lol trying to hack google is a Self Delete mission.
No stuff, then again someone was able to buy google.com for a dollar and own it for a few hours due to google forgetting to renew their domain.