[ianai]

Why not just edit the video codecs to support calling out to advertisements? Maybe offer people the option to watch the ads at start, end, or usual positioning, too. There would be abuse, but if it were done correctly the abuse wouldn’t be more than current.

[afiori]

My first reaction would be video player support. You would almost need to force a plugin for that.

Something slightly similar could be to distribute an offline player that is the only one that can play your content and that enforces some kind of advertisement.

But I would be of the opinion that it is better to go all-in in this kind of pivots