Except that it doesn't work like this, as the CRUD web app needs a database to connect to, and this article doesn't explain how to scale a database over a 1000

Except that it doesn't work like this, as the CRUD web app needs a database to connect to, and this article doesn't explain how to scale a database over a 1000 node cluster which is not trivial at all, and not explained in any of the linked tutorials either. So it's up to the reader to imagine what kind of application would need a thousand web frontends without any form of persistant storage..