Depending on the cost per database, a service like this could allow one to build SAAS apps with Single Tenant model [1] in a really simple and elegant way.

I always liked this model since it gives the best isolation and not having to code with multi-tenant in mind really simplifies development and security. But maintaing an infra for this is hard and costly.

[1] https://docs.microsoft.com/en-us/azure/architecture/isv/appl...