On the other hand, this nudges publishers toward an idea that's big in the IndieWeb movement: Publish (on your) Own Site, Syndicate Elsewhere (or POSSE for short).
The idea is to own the canonical copy of the content on your own site but then to send that content everywhere you can. Or rather, everywhere you want to reach your readers. Facebook Instant Article? Sure, hook up the RSS feed. Apple News? Send the feed over there, too. AMP? Sure, generate an AMP page. No need to stop there—tap the new Medium API and half a dozen others as well.