> Serverless container services such as Heroku, Netlify, AWS ECS/EKS Fargate, Google Kubernetes Engine, and Azure Kubernetes Service
IMO I don't think Heroku and others fit the serverless paradigm.
To me serverless is about automatic scaling of performance and cost.
With Heroku you need to provision capacity in advance, and you pay for it whether you use it or not. Heroku doesn't scale automatically either, you do that manually.