I have been working on Kickstarter and Indiegogo projects for a number of years now and I have collected 200,000+ backer email addresses from the projects I have worked on. All my data collection is done so legally ofcourse. Please send me an email email@example.com if you would like to use my backer database. I’m happy to share with you and/or other passionate crowdfunders.
The services you mentioned here are interesting, but none of them allow you to export backer email addresses.