If they go bankrupt, yes. If they simply decide to go out of business in advance of running out of money (e.g., the owner is like "I've been thinking of retiring and now is a pretty good excuse"), write the terms of it so there's some obligation to refund the card.
That said, there have been enough Patreons/GoFundMes for local businesses, so I think that people understand that going bankrupt despite best efforts is a risk and enough people are willing to pay anyway to try to keep their local coffee shop open.
That said, there have been enough Patreons/GoFundMes for local businesses, so I think that people understand that going bankrupt despite best efforts is a risk and enough people are willing to pay anyway to try to keep their local coffee shop open.