As included under Terms and Conditions, point 15.1:
15. Use of Backer Information
15.1 Backers' personal information provided during this Campaign will be used solely for the purpose of the Campaign and will not be shared with third parties (aside from service providers such as Mailchimp and others who allow us to communicate with backers, analyze data, and gain other strategic benefits). We are committed to maintaining the privacy and security of this information. We will not sell your data.