Unified hosting options

The following (in-complete) list of hosting providers offer specialized Drupal hosting while being able to host a decoupled frontend.

Amazee.io

Amazee.io provides a managed open source hosting platform based on Kubernetes. It offers Drupal hosting and Node.js support. It provides the flexibility to add backend and frontend in one project, or as separate projects.

Pantheon.io

Pantheon.io offers Drupal hosting and optionally a decoupled frontend site as well. Still, the frontend is deployed separately from the backend, so each sytem can be deployed on its own.

upsun

upsun (by platform.sh) is a cloud application platform. It offers Drupal support as well as Node.js support. Depending on the configuration, frontend and backend can be deployed as a single app, or as two separate apps.