AWS can be considered the industry-standard solution for cloud storage, streaming services and music libraries, but being a shared infrastructure, definitely they cannot guarantee the computational resources required by mission-critical tasks, such as support sudden high market activities;
That's pretty much the opposite of reality. AWS resources can be scaled up quickly and seamlessly unlike a server rack. You're also overestimating how much hardware a site like Binance really needs. It's nowhere near facebook scale. That's not to say they don't have scalability issues but you're not really proving that.