Option 1: If the rest of the key team (Owner and PM) stay onboard, then you can negotiate for sweat equity.
Option 2: If nobody wants to continue working on the project, then the conversation changes to, what does it take for you to own the existing code base.
Whatever the case, working for free without any compensation (whether monetary or share of the business) ends in hurt feelings all around.
Option 1: If the rest of the key team (Owner and PM) stay onboard, then you can negotiate for sweat equity.
Option 2: If nobody wants to continue working on the project, then the conversation changes to, what does it take for you to own the existing code base.
Whatever the case, working for free without any compensation (whether monetary or share of the business) ends in hurt feelings all around.