To be fair, unlike google they are not cancelling any services. I think Amazon first builds these services for internal use, and then releases them to the public.

To be fair, you have to pay per unit for these services, so as long as people are using them, Amazon is making money. Putting a service out to pasture in maintenance mode probably wouldn't cost that much.

Maintenance on all of their services is non-trivial in terms of people at least. However if they are used internally, directly or indirectly then they're already paying for it.

We will see. I hope I am wrong but how many of these are production ready? It seems to be that most of them are in preview/beta.

As far as I know this isn't the case (used to work across from them)

If you listen to Amazon at their shin-digs, they tell it like all of these new services and features are in response to requests from existing customers.