You're seeing Cognito User Pool pricing. Cognito User Pools is basically having AWS host your user / password / details database for an app you're building. It takes care of some details like verifying e-mail addresses / phone numbers and integrates with Cogito Federated Identities, which makes it easy for your app to (for example) allow login via Google, Facebook, or an account they create (which is stored in that user pool).
This Google service looks more comparable to Okta or auth0. That is like if you're a sysadmin at a big company and you want one place where your users can be authenticated, which can then allow access to all of the web apps you use (Dropbox, Salesforce, Gmail, etc.).
EDIT: And to tie them together a little:
If you were building a web app using Cognito, you could likely add a federated identity via Okta, auth0, or this Google service, which would then allow your users to log in directly to your service through that without having to create / manage an account separately.
You're seeing Cognito User Pool pricing. Cognito User Pools is basically having AWS host your user / password / details database for an app you're building. It takes care of some details like verifying e-mail addresses / phone numbers and integrates with Cogito Federated Identities, which makes it easy for your app to (for example) allow login via Google, Facebook, or an account they create (which is stored in that user pool).
This Google service looks more comparable to Okta or auth0. That is like if you're a sysadmin at a big company and you want one place where your users can be authenticated, which can then allow access to all of the web apps you use (Dropbox, Salesforce, Gmail, etc.).
EDIT: And to tie them together a little:
If you were building a web app using Cognito, you could likely add a federated identity via Okta, auth0, or this Google service, which would then allow your users to log in directly to your service through that without having to create / manage an account separately.