Subscriptions aren't mandatory and they can be purchased anytime after full payment and before, on, or after delivery. But by not taking one, you will be missing out on some great feature benefits. However, the subscription will be activated (if purchased prior) only on the delivery date or on the date of subscription, if purchased post-delivery.
Ather Connect - Navigation, software updates (OTA), and daily & monthly ride statistics.
Ather Service - Regular periodic servicing inclusive of all service and consumables.
That's subscribing for peace of mind.