Stretch the payout window to indefinite and charge 0.01 SBD, or what ever reasonable amount, to watch the video. Pay per view. Problem solved and no commercials other than making a trailer to lure customers in to watching your video. Can this be done? I don't see why not.
As soon as you allow ads, you invite the advertisers to tell you what is acceptable and we already have YT as a good example of how that works.
The problem though, is maybe not everyone who will watch a video wants to join Steemit/Dtube. With YouTube, anyone can watch those videos and be compensated, but the people watching don't have to join YouTube to make the creators money.
In the future, everyone will be on web 3.0 which will have smart contracts embedded that will link into one's own business tokens that can be atomic swapped to any other cryptocurrency. This means that everyone will have a vote without joining anything. AD's are a dying model in this world. It represents an inadequate thinking out and balancing of how things will work. In the future this will not be necessary because the false scarcity model will be broken once the system of financial exclusion falls.
When I was young, the KYC model wasn't fully implemented yet and prosperity was happening everywhere (not just America) and advertising was very unsophisticated. Look at old videos around the 60's in Iran for example. We tend to think that they were primitive and nothing excelled the USA, but that is false. All this decline is due to the banking elites forcing the model of fake scarcity upon us.