Ask HN: Faster and cheaper cloud service to build MVP WebApp

I have always avoided using cloud services to create personal projects or web apps for clients. I've always been afraid of getting too attached to a vendor and, if the application grows in terms of audience, of incurring exorbitant costs.

I have used AWS in the past for server provisioning and it has been very convenient to use all the features of the cloud. In the end, however, the costs remained too high compared to a baremetal solution and, in the end, I am using servers from OVH and Hetzner.

As far as application development is concerned, however, I have realized that re-creating a full stack takes a long time and the vast majority of web applications will never go beyond a certain number of users connected at the same time. So it could definitely be interesting to use the services.

I'm curious about your experiences using only cloud services (Firebase style) including lambda services:

What is the cheapest and fastest cloud stack to implement to create an MVP webapp that includes some or all of the following features: - Authentication - Authorization (ACL) and user management - Database for CRUD operations - High level CRUD functions already implemented (framework style) - Sending mail / messages - Queues and programming - K/W store - Logs I would like to know your experience also in terms of costs for, for example, 1000 or 10000 users who use the APP daily. Also any notable downside. I realize that the question is very general but any opinion and experience can be useful. Thanks a lot and I apologize for my English. It is not my mother tongue.

Thank you very much for your reply.