At some point in a startup, you need to be all-in. No half measures. That is how it works. So if the board wants you to join full-time as CTO, I don't see why t

At some point in a startup, you need to be all-in. No half measures. That is how it works. So if the board wants you to join full-time as CTO, I don't see why that is an issue. You can be a part-time "employee" if you want, but you need to be a full-time CTO. It is about skin in the game. Either you are all-in or you are not. Also, don' work for free. The startup is 3 years old and CTO still works without any pay ? Something is strange here.