All monthly subscriptions are ongoing. There is no 3-month subscription.
Comparing to a one-time purchase, a subscription offers a commitment for future purchases. This is convenient for both the buyer and seller. Therefore, the seller can give a 20% discount to the buyer. However, some buyers just want the 20% discount. They cancel the subscription as soon as they made the first purchase. This causes a loss to the business. To avoid such incidents, a minimum of 3-months is required for a subscription.
The 3-month term is a requirement. It means that you can cancel the subscription after 3 months. This does not mean it is a short-term 3-month subscription.
If you do not cancel the subscription, it continues.
Reversal of aging is a long-term process. It requires a commitment. Most customers continue the subscription without stopping.