The issue with FAANG is that they already have the infrastructure to make these large scale deployments. So any new system - by necessity - needs to conform to that large scale architecture.

The other nice thing about FAANG is that almost nothing they do is actually necessary. If Facebook rolls out a new feature and breaks something for a few hours, it doesn't actually matter. It's harder to move fast and break things if you're, say, a bank, and every minute of downtime is a minute where your customers can't access their money. Enough minutes go by and you may have a very, very expensive crisis on your hands.