Oh, I've just remembered that there is, in fact, a feature by which pictures and other multimedia are stored in a blockchain, even here. First I thought that the problem you pointed out belongs to our future, but that's not true, because we already have the IPFS. It is really a "multimedia blockchain".

I vaguely remember that Busy was already using the IPFS protocol for its pictures, but certainly Dtube gives the option to upload the videos to it. I'll explore a bit more about this.