Why did Amazon's AWS outage disrupt Snapchat, Ring and many other services?

Amazon's cloud computing service experienced a major outage on Monday, disrupting many online services, including Snapchat, Roblox and Signal.
来自MSN

CVS System Outage Delays Prescriptions One Day After Major AWS Meltdown

20. Those with outages from the AWS incident included Amazon, Delta Air Lines, Lyft, Reddit, Ring, Roblox, Snapchat, United Airlines, and Venmo. CVS replied to a frustrated customer to explain the ...