The OP is probably a good person with strong interest in data science and building projects.
If it'd be "oh here's your $500 charge, upgrade your quota for more, 'ok fair enough, I did a mistake'", but $14k is not ok without explicit quota upgrade.
Unfortunately, if the customer has written their applications in such a way that they're effectively locked to the platform... they won't have much choice until they can dis-entangle themselves.
After that though, yeah. ;)
This was one of the main selling points for all portfolio companies of the group to adopt AWS in their digital transformation projects.
I would love to kick the tires on some AWS stuff, but the threat of unlimited ruin is not worth it. Sure, maybe the gods would take pity on me and wipe the debt, but far easier to just run with someone who caps costs. My toy project can gladly go down if the alternative is a huge unexpected bill.