@overholt @gruber Or, unpopular opinion time:
Don't waive the refunds. Those companies are sub-50 employee firms and legally protected from personal liability. There is no guarantee that any startup succeeds, and why should the end-user get stuck holding the bag? Let the banks and investors take the bath that it's part of their job description to take, let their software engineers and other employees go on to other opportunities, and go about your day.
If the lesson learned by the industry is "Don't hitch your wagon to either app stores or private social networks," it'd be a valuable lesson.