Because IT is your social media's business. They know IT inside and out. They understand what can go wrong and how to mitigate it. The business for airlines (for example) is to fly planes. They are pretty damn good at it. IT, however, is just a tool to them that they buy elsewhere. They don't understand it in the same way as social media. They rely on outside contractors to do it right: outside contractors who get the job based on being the cheapest or convincing the buyers their service is "industry best practice."
I wouldn't overestimate FAANG's immunity to crash-the-world config updates. Facebook had everything including engineers' access to the datacenter down for hours in 2021:
Compare the salaries, working conditions and prestige offered by tech jobs at a social media companies vs some large legacy company like a bank or airline.
In the former, you are paid well and have some sort of prestige and political capital. In the latter, you are underpaid and your prestige/political capital is often equivalent to the janitor's.
Meta is one of the most valuable companies in the world with the most resources to buy the best of everything. At 1,280 Billion dollars of market cap it is 30x bigger than American, Delta and United put together. It made $39 Billion last year compared to $7.8 Billion for all US airlines together. Of course it has better systems.
Because they don't do mass rollouts on the servers. Then again those companies could fail if they had single point of failure with automatic mass deployments...
This could happen for anything that supports this type of automatic mass deployment. Just in this case that thing was popular enough and happened on one of the most popular platforms.
