What’s there to understand about that? That’s literately the point where a company needs to file for bankruptcy. Or do you also understand when you pay a craftsman to fix your house, but they won’t show up for months, because they don’t have the money anymore to pay for the materials they need for your house — the money you actually already gave them?
An argument for Purism is that – if they succeed – millions of people or more can benefit from the mobile Linux, whereas if all refunds are paid, hunderds (?) of people would benefit…
By this logic every company should stay in business for ever, no matter how crappy their business practices are.
Also in the case of Purism this logic makes even less sense than for other companies, since Purism’s products are or should be open anyway, so any successor with a better business plan could continue right where Purism had to stop.