Is a mutual ND Agreement suitable for co-founders who've agreed to work under specific terms?

Terms discussed and agreed: -3 months period to see how well we can work together. -Agreement with no compensation until business starts to make money. -Volunteers hours in exchange for Business development experience supporting an early stage startup -20/25hrs per week Initial contribution: -Offer some support on creating the brand -Research, identify, and negotiate partnerships with businesses who can enhance business offerings -Collaborate with the marketing team to target and recruit new users -Email tips and tricks to better land meetings with busy people -Represent business in meetings and industry events as well as put together top level creative presentations that help generate excitement for new partnership…