My wife sells knitting related things (patterns, books, yarn) on ravelry.com. They collect the payment for her and transfer the money to her paypal account. I suspect it will be a while before stripe can do such a thing.
From there, your wife could transfer the money directly into her own regular bank account.
If ravelry.com goes out of business before they transfer the money to her paypal account, there is no chance that they can take any of her money with them. (While highly illegal, I've seen this happen elsewhere with a similar setup.)