So RSS isn't an API because it returns XML instead of JSON or protobufs? That doesn't sound right. It's an endpoint for machine consumption and that's what most

So RSS isn't an API because it returns XML instead of JSON or protobufs? That doesn't sound right. It's an endpoint for machine consumption and that's what most people mean when they refer to an API. But that's a distraction from the point. It's trivial to implement an RSS endpoint, but what's not trivial is requiring everyone to implement it. Needing someone to implement an API just to have machine-friendly pull access to their latest content is only a trade-off that made sense last decade. It's not a good solution if you had the power of generating feeds yourself.