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Vercel on the frontend and Heroku on the backend already do this, so you have something specific in mind?

Yup, providing same experience as Heroku on AWS.

The reason being it's a lot cheaper (almost by 10 fold in some cases), and easy integration with services like SQS/SNS.

Heroku is on AWS. But I agree that making more components simple to use is helpful.

Vercel also on the backend if you're using Next.js API routes, I guess