Maybe by gigabytes, but the bulk of the volume of posts is probably paywalled high quality image files, chapters, audio files, etc. Their tools for organizing it is lacking, but it's great for hosting most things. I expect video to join it the moment native video hosting is available to everyone.
I have a Patreon page with hundreds of supporters. If I want to post a video for my supporters, it has to be hosted elsewhere. Patreon will not host and serve it.