Consider the number of times you’ve been on a website but came across content from a completely different website on their webpage. Whether its videos, images or portfolio pages, seeing them on a completely different website raises the question of ‘valid content sharing.’
Furthermore, if you own a WordPress website run my media content, you’ll have to deal with storage issues for your video/audio/image content at some point. Uploading videos, images and such content on your servers fill up space. There’s only so much hosting space available to you before it all runs out.