Tarmack
Rhetorical Porcupine
I noticed on that site that a lot of them have the non-commercial stipulation on the CC license. Out of about 10 different curators I checked, I found one that at least allowed commercial use.
This is actually a very interesting point of discussion on the topic, one that I've carried through from a number of other license sources. I'm not certain, even after reading through all of the CC source material whether or not YouTube application is or would be considered commercial.
https://wiki.creativecommons.org/NonCommercial_interpretation
The thing about commercial use is that it tends to be directed primarily at a salable product or something that is behind a pay gate of some kind. On YouTube, we're not selling the content. Rather we are selling the viewer to the ad company. So where it comes to commercial and non-commercial use, especially and specifically in the world of video games for example, this actually qualifies as non-commercial by the vast majority of license terms that companies have posted.
To put it into laymans terms, the licenses will often say in effect, "you can't sell our stuff, but you can give it away freely and if ads happen along the way, meh".
Right in the CC documentation they say "However, there will always be uses that are challenging to categorize as commercial or non-commercial.". If it was merely a question of whether money was involved or not, they wouldn't need to say that.
It does mean, I think, that users of CC content should be more vigilant about the type of license. Frankly, I doubt that will ever happen because most YouTubers are extremely lazy on the law front and simply don't care. But contacting someone who has listed their material under Creative Commons is really not that hard, and asking whether they include YouTube monetization in their view of non-commercial would be very easy.
As an aside, that's one of my major gripes with this community in general. This doesn't apply to everyone or the forum specifically, but the sheer number of people who pop up, ask an incredibly complex question expecting a simple answer in their favor is mind-boggling. "Will I get a copyright strike if I use the latest Taylor Swift song?" All the while having no concept of what a copyright strike is, does or how it affects you, only knowing it is somehow bad to get. Or "what network is best" as though to assume a network over none is best, or that there could indeed actually be a best network. Irritating at best. And oh gods... the number of people who think Royalty Free is the same thing as free.