I know that this (https://www.ory.sh/docs/kratos/guides/multi-tenancy-multitenant) states that multi tenancy is only possible to achieve with the ory network. But wouldn't it be possible if the "tenant" will be stored alongside the identity? or as the "metadata_*" info? Well at least a lightweight variant of it?

This may help you understand metadata and traits in Kratos: https://www.ory.sh/docs/kratos/manage-identities/managing-users-identities-metadata#:~:text=Traits%20are%20the%20attributes%20of,the%20%2Fadmin%2Fidentities%20APIs. You could store that tenant information with the identity, just make sure you store it in the right property type as described for you needs.

Thanks for the clarification. But it seems like the sentence in the initial paragraph about metadata is not complete. Was helpful nontheless