Put really concisely: you want to add serverless functions to your own SaaS platform. This is how you do it.
Expanded: Imagine (e.g.) a first-party Slack or Discord "Functions" offering, or a CRM tool (e.g. "Notion Functions") that allows you to consume + handle events directly as a user. Don't need to ask your users to sign up for, configure, maintain, (etc) $SERVERLESS_PLATFORM on their own, outside of your product. Give them an editor, do your own pre/post hooks, and plumb through relevant metadata that they can consume in their functions out-of-the-box.
(Disclaimer: work at Cloudflare, not on Workers, feedback on blog content is helpful)