Television

It's the Gym Membership profit model. At any given time, all gyms have far more subscribers than they have capacity to handle. But they know only a subset of subscribers will show up regularly, and many will never be there at all.

Fractional reserve fitness

Yes, although part of the gym membership profit model is what I alluded to in the second paragraph. Usually they make it quite difficult to cancel and have long minimum subscription durations (or charge you a multiple for month to month basis).

So I wonder if we will see that becoming the norm for streaming services as well at some point. At least the long durations. I guess they cant make it as difficult to cancel as gym memberships, since it's all online and automated.

Except for January 2nd, then the gym is an absolute shit show

Gyms have the advantage of ostensibly being beneficial for health, which I'm sure also prevents people from canceling. They feel like they really should be going, just aren't.