Is the account created a CSS "normal" account ?

[bourgeoa]

Can you login to the created account using the usual processes either with the normal route or with credentials ?

In CSS you can seed an account
https://communitysolidserver.github.io/CommunitySolidServer/latest/usage/seeding-pods/

It would be nice to have something like this using the google/github SSO
This may be is more what FedCM could do.

[jg10-mastodon-social]

I would say the answer is no.

The component is designed to provide storage only for a single app.
#3 (comment)

This includes bypassing consent in a way that means that enabling access from non-white listed apps would be insecure.
#5 (comment)

Perhaps a data browser could be provided and whitelisted, but my understanding is that's not the intended use case.