As a junior developer I'm always afraid using any AWS service to make a mistake that cost me a lot of money. I'm not talking about millions, simply 2k would be really bad for me.
Anyone who is personally liable for the the bill should be terrified of AWS. It's enough to lose your business to a usage spike, much worse to lose your home and car.
I struggle to consider a scenario where setting up a limited liability organisation wouldn't make sense, even if only for interacting with Amazon.
As sibling reply also says, even if they do eventually zero it out, do you want to owe the richest guy on the planet $100k? He has law firms like you have pairs of socks.
Obviously everything I'm saying goes for unlimited-billing cloud infrastructure, where your customers (or your mistakes) generate cost out of view.
I had been in the same position for about ten years until I set up a limited liability company. It does take some effort to set up and costs about $20/month[1], but to me the peace of mind is well worth it.
I struggle to consider a scenario where setting up a limited liability organisation wouldn't make sense, even if only for interacting with Amazon.