I do not think the intentions here are to be opportunistic and predatory but inability to empathize with small developers. A large customer will very likely just pay off few hundred thousand dollars extra expenses. It is only individual developers who are at risk here and cloud operators do not have much interest in them.

I don't know about that. Large customers can almost always find the capital to run their own infrastructure and save on cost. That's not to say that there aren't big customers of these types of services or that certain business models make using them more attractive than maintaining infrastructure yourself, but I would guess that revenue from these sorts of services are largely built on appealing to smaller customers, so their needs would be taken into consideration. Not taking potential cost overruns into consideration to me seems a bit deliberate.

To me it looks very similar to the personal checking overdraft schemes banks were using up until a few years ago.

When I was a young and naive student I thought I could not charge my debit card under 0$. Got down to -3$ and had to pay a 40$ something fee when I already was out of money.

Definitely drank a few 45 dollar lattes in my day. Sucks.