I think very few people understand how DTube works behind the scenes, even when it comes to tech minded people, it's just really complex. It started out using just IPFS and Steem, now it also uses WebTorrent. And all of these are fairly new and not mainstream.

Understanding how Steem works on it's own is quite tough, took me weeks to fully understand why it uses three different crypto currencies (Steem, Steem Power and Steem Dollars) and what the difference is. And then half a year later when I started writing apps for Steem I found out that Steem Power doesn't actually exist, it's just an abstraction on top of something valled "vesting shares", to make the concept easier to understand. It's quite remarkable that it has gotten so popular despite how difficult it is to understand it. But I guess that's due to the huge potential to make money on Steem, there is a big incentive to spend a lot of time figuring out what it is, so people do, and probably get help from friends who told them about Steem in the first place.