I actually use fly.io for the rare time I want to run something in the cloud, for exactly the reason that they allow you to pre-pay a fixed amount, and once tha

I actually use fly.io for the rare time I want to run something in the cloud, for exactly the reason that they allow you to pre-pay a fixed amount, and once that runs out, your instance gets shut down. This means that I can't misconfigure my way to a three-figure-plus bill, which is hard to find in cloud providers.