Many years ago I backed the Jolla Tablet, which never shipped and they never gave me a refund. At the time the company kept pretending like things were perfectly fine with every update right until they let everyone know that the project was being cancelled. There was zero transparency and accountability, and from that day I vowed to never support this company ever again. I would've been fine if the project had failed…
There was a blog post committing to refunds given sufficient cashflow, posted in 2017:
https://blog.jolla.com/summer-2017-ceo-update/>
HN discussion: https://news.ycombinator.com/item?id=14637748>
It does appear that Jolla has shipped other products (SailfishOS, the Jolla Phone in 2013, some tablets, and others, see Wikipedia: https://en.wikipedia.org/wiki/Jolla#Sailfish_OS_products>).
Since 2017 the company has gone through bankruptcy and re-launched.
It should be remembered that kickstarter / crowdfunded ventures, as with any other, are speculative and risky. A good-faith effort to deliver on spec is itself credible, and the landscape is littered with the husks of far more failures, especially in the mobile space, including from former (and current) giants: RIM, Palm, Microsoft, Mozilla, Canonical, off the top of my head). Google and Apple are the only present significant OS options standing, Apple (again) and Samsung dominate hardware, though there's increasing competition largely from China.