This custom plan is the Standard Asri tier monthly with a maximum of 3 people per group. You get reading access to premium articles, daily newsletters, and most of The Information content on a monthly subscription period. Since access is granted through a shared account login, follow the usage rules set by admin so all members stay comfortable reading. The 1 user plan is open now and group plans will follow once admin announces it via WhatsApp.
The shared account usage rules explain what is allowed and not allowed when the account is used in rotation. You may not change the password, change the account email, or log out other devices so other members do not lose access. Access sharing is usually done through login credentials that admin sends to each member's WhatsApp after the plan is activated. If rules are broken, other members may lose access and that responsibility falls on the violator, not JoinBareng.
Group plans open when enough slots are filled. Once the group is full, admin will activate the plan and send access to all members via WhatsApp. If the group is not full by the due period, admin will refund according to the applicable policy. So make sure you have read the rules before joining so the group buy experience feels safe and comfortable for all members.