It mostly depends on the type of content you do. If you do reviews, analysis, or commentaries, then it's usually fair use anyway.
But if you're just doing things like ... re-uploading entire songs verbatim just so you can get views without any creative effort on your part, then yeah, it's probably not safe.
But even if you're in the clear as far as copyright law is concerned, you most likely won't get monetized by Youtube because you'd be in violation of youtube's policy on repetitive content. See ...
So if you're looking to make money on youtube, you'll need to do something original anyway. You can re-use content, but you have to add substantial new content (such as commentary or reactions), at which point, you might as well just go with the "fair use" excuse, rather than "creative commons."
I personally only use creative commons for things like background music, or for gameplay footage of a video game that I'm doing a retrospective on. My commentary and analysis in my videos is still the primary focus of the video. So my videos are still fair use regardless of creative commons status.