Fixing that would require me to figure out how to deploy appengine stuff, now that Google requires you to use a whole new deployment flow, with a credit card required.

Not gonna do that unless something more major breaks...

There is pretty much no customer support required - I only received 12 emails about it last year. There have only been a handful of thefts. The vast majority of wallets never get stolen.

Yeah - the whole thing is appengine, fitting fully in the free tier, and getting the html template for that home page working on every browser was the hardest bit. There's no login or anything, and the database is just one record per sale. Wallets are all pregenerated. Checking for theft just involves polling a block-explorer API and sending a mail if anything changed.