I already have an established email list on a provider (ConvertKit). Will there be any option to build integrations into the system because right now it makes no sense to build a new email list strictly on Subkit.

Also, in order to upload emails from my ESP I'd need all of their permission to upload their emails into a completely different system as per email marketing laws (at least in Canada) which means technically they need to "re-subscribe" on subkit.