Bonus Ink may not be used for tipping.
Ink bought in the Ink Shop or earned by completing other special offers may be given as support, but bonus Ink received for signing up, inviting friends, or in gifts may only be used to unlock episodes.
When viewing the Ink Shop or when trying to support a creator, tap/click the (?) next to your balance for a breakdown of Ink bought and earned, versus bonus Ink.
Learn about Ink and how to buy or earn more to support creators.