Handle exhausted subscription remaining consumable

[reyraa]

Users stream audios using subscriptions. It is likely that the subscription ends with a remaining consumable less than required for steaming Ana audio. we should make a decision for the remains balance of the subscription. There are a few suggestions:

• Transfer to a bounty account to be used for the free plans.
• Transfer the remaining to the dev account to be used for development purposes.
• Burn it.

Pleas back your suggestion with a descriptive rational.