> It's at the point now where almost all of them from YouTube go to the spam folder. It doesn't make any sense since they are emails from Google

It makes a lot of sense... people use the spam button as a lazy man's unsubscribe. Youtube adding the bell button, making mail opt in is probably a response to that.

I actually give Google a lot of cred for not simply white-listing its own domains. Though spammers would probably find ways to abuse it and make them look bad anyway.