I'm sure YouTube would love to be more lenient. If they could say "anything goes" they'd be thrilled, but we know they cannot because of the LAWS that are protecting IP owners.
IP should be protected, but to what extent?
And the bigger problem is the amount, and rate, of which content being produced threatens everyone's ability to do anything!
Try naming a business. NOTHING is available. If you want to run a competing business in a saturated market, the naming options are almost non-existent, especially if you want to name your company something that embodies what your business does.
Music is having this problem too. When you can take a few stanzas and say you OWN that music, could someone not just use a computer to generate every possible sequence of notes, slap a copyright on it, and own all future music?
Photography, video, games, puzzles, speeches, books..... it's all about to hit a brick wall if we can't be more lenient with IP.
In my opinion, complete works should be awarded a copyright, but sub-sections of works should not.
And software patents..... dear god.