When you register or upgrade to an Enterprise subscription, you become the “account holder” and then you can invite any co-workers to join your account. To join, each co-worker registers individually as a free “Basic” user. If their email address ends with the same @domain suffix then while they register for free with a “Basic” account, they will be immediately upgraded to Enterprise. This way, each user has their individual account and login.
Likewise, if or when you as account holder cancel your subscription, then all your co-workers’ accounts automatically down-grade from Enterprise back to Basic.