This is what the creator says:

I have recently created the @dtube account. This account will be used to collect 25% of the DTube author rewards. 10% of these fees will be used to pay for long-term storage of the files on IPFS Store. The rate is $0.044 per GB per month. So, for example, let's say you upload a 100MB video, that earns $10 rewards, then $0.25 will go to @nannal and ensure data redundancy for ~57 months.

https://steemit.com/video/@heimindanger/introducing-dtube-a-decentralized-video-platform-using-steem-and-ipfs