This is like saying I was able to sneak into a concert. Sure, but at some point the restrictions are gonna come down hard.
It's not like sneaking into a concert. It's like attending a free concert at a mall and wearing a mask so the cameras can't read your lips. Or covering your phone screen with your hand when you show a friend a private photo of a special moment.
Who pays for the electricity, upkeep, security and airconditioning of the mall? Who pays for the sound stage, the technicians, the lighting of the mall?
The band decided to perform at the mall, because they like the facilities there. They always had a choice to perform at their house ("own website"), but they chose the mall ("YouTube") and as long as YouTube is hosting their videos, YouTube deserves to be compensated.