Neither. Optimizing for user experience. Like it or not there's a new category of video content, short, casual videos. From the cooking shorts that are taking over facebook feeds to the the jealousy inducing short clips from my friends BBQ last night, this content category is growing.

Snapchat has the best UX for this type of content.

The simple idea of "tapping" to skip is the equivalent to the tab key when you're using excel. Life is better with it, and you miss it when you can't use it in other apps.