Here's some context for those who, like me, never heard about Unison before:

This service is apparently directed at developers using a programming language called Unison ― hence the name: Unison Cloud.

As I understand it, this is akin to launching a service called Python Cloud (by the PSF, as part of the language?) where Python developers can deploy their apps as a function call:

  # app.py

  class App:  
    def get(self, req):  
      name = req.GET.get("name")  
      return f"<p>hello {name}!</p>"

    def deploy(self):  
      from PyCloud import cloud  
      project = cloud.create_project(self)  
      project.deploy()  

  # main.py

  from .app import App

  app = App()  
  url = app.deploy()