Apple's whole business model is creating hype around their products. And if this hype is preemptively damaged by leaking secrets that would otherwise feed the hype, they clearly are negatively affected by this. I don't say any of this is good, that's just their business model. And capitalism of course...

However, in this case here the youtuber imo didn't really reveal the product itself, but only a mockup version. Shouldn't that be even beneficial to Apple? I'd think creating all this buzz around the "leak" is just one way to try to get more hype going for them.