OK, so let's ban Firefox from the app store for packaging other people's content. He didn't package, nor did he take their material - that implies that his app somehow contained their content. It did not. It simply let you browse their YouTube channel for content the content holder had made freely available.

(also, your comparison to houses and cars is nigh-on nonsensical: copyrighted material is not a possession, and one person using it does not preclude another person using it, whereas if someone took my car I would be down by one car.)