> Oftentimes that end date is not clearly knowable and can't be communicated explicitly

I am pretty sure that whatever contract streaming platform has with publishers has a some kind of date. It might be unpleasantly short (a year or month) making it look like a bad deal, but that's the point.

In current situation the "unknowable" date might be as short as 1 day. It's up to the good will of streaming service to warn ahead of time. Knowing what you get and the quantity of it is the most basic part of fair deal.

If a streaming service has only negotiated a 1 month license they shouldn't be allowed to re-license the content for longer period. If they want to offer longer deal they need to negotiate better license with publisher or take the risk on themselves by being prepared to give refund in the case of failure to deliver promised service. Telling that they guarantee only single year of service to provide doesn't prevent them from providing it longer.

If a travel agency rents a bus for a day, offering a 1 week trip around Europe would be considered a scam.