@ahaldorsen Thank you so much. I have been taking it at my pace :)
Regarding the estimate, it's just that. I have instances on the Moon plan (5 estimated) with hundreds of active users and they are not hitting the limits. I have other cases where a single user instance can be on the Galaxy plan.
So, it really depends on the usage and Active Users is not what defines the plan you need (there are no limits in place for users, registered or active). The value is just provided as a rough estimate