I've been doing reliability for most of my career, and have always been able to hide behind, "We're not a bank, if we lose a few requests it doesn't matter". They can't do that. :)

One advantage that they have is that the market closes, so they can do maintenance that takes the whole system down, but when you're running a global consumer product, it's a lot harder to do that without pushback.

So for most of us, our stress is around zero downtime maintenance, and theirs is around never dropping a request when the system is live.