Im guessing here but wouldn't it make sense to have nodes only store a portion of the files so you could divide up the storage burden across many nodes. So if u had 1 million nodes each hosting 5 gigabytes , you could host YouTube itself ;) there would need to be some overlap so maybe store each video 3-4 times on the network
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The blockchain does not store the video or the images, just a small hash of the two.
There are blockchains which do that now, but for fragmentation they rely on users of the blockchain to help by storing parts of files on their computers, for example. They then get some remuneration when files are retrieved.
Steemit is different. There are mainly just witnesses, as I understand it. There are other nodes as well, but they are just that, "other', and do not form the backbone of the system. I don't know how correct I am in this, but I do know that developing a big network for the readily accessibility of large amounts of data is a big task, and is not just a case of an add-on.