There used to be a world where all things on Twitter and Facebook were published to RSS feeds, drastically lowering the barriers to entry for experimenting with content consumption ideas, or cross-content aggregation, or personalization, etc.
There used to be a world where big, public technology players like Google and Firefox were helping on-board new users, and appeared to be making a long-term commitment to the technology. When Google Reader was a thing, the rate at which non-technical users in my personal network were starting to talk about RSS was astounding. And _everybody_ was thinking about whether or not RSS was a natural fit for their product/idea/platform/drone/toaster.
There was a moment in history where RSS was poised to become as ubiquitous as e-mail. But that opportunity was taken away, because the big tech companies either couldn't or wouldn't innovate on their business models, instead they're focused on the near-zero-sum game of user acquisition and retention.
A similar thing happened in the late 1990s with the major ISPs - AOL/Compuserve/Prodigy/etc actively encouraged you to only communicate in-network, e.g. how their chat clients initially worked. Unfortunately for them (but fortunately for us), their core identity system was based on the already standardized technology of e-mail. And eventually the ability of others to provide better/different experiences via e-mail (Eudora, Hotmail, Gmail, etc) changed how people viewed those networks.
This time around, the big tech companies are much more self-conscious regarding user base degradation, and the risks of having their core user experience compromised by out-of-network innovation. Consumers always lose this game.