Parse Platform as API multichannel content centric products, website, RSS, AMP, PWA and native app?

I'm new to parse. I have dozens of news and magazine sites with and without authentication and comments, all of them have AMP and RSS, some have an app. I'll add a lot of personalization to them, like notifications, following of authors and personal news feeds and maybe replace the native apps. I was wondering if Parse is useful as Graphql API for all these platforms, for Authentication, notifications etc, but also as a content API, and not just for the apps. I'd set up an app for each brand and use the app API with react, react native or Gatsbyjs for smaller sites. I know it's a very newbie question, but I couldn't find any discussions about similar and I hope the idea isn't too farfetched.