Update: I have reached out to the nice Stripe employee who volunteered their email, let's see what happens.
It's been pointed out a few times that my marketing says the site won't die, and me killing it would be very ironic. This is 100% true, and I have decided to leave the site up even if Stripe decides to ultimately close my account. Luckily, our infrastructure costs are very low (<$5 month currently).
I created this site when Google Play Music went down and lots of people were complaining about Google killing yet another product. I don't want to do the same thing to my users.
Finally, I would like to take this opportunity to plug a similar service that I am completely unrelated to. I saw its author post on HN and they seem like they are also a one-man-shop: https://asti.ga This service is different in that it lets you hook it up to your own cloud storage. I am only now realizing why this is such a brilliant idea.