Having been on the team that issued postmortems before, I can tell you that we said as little as possible in as vague a way as possible while meeting our minimum legal requirements. Actual Facebook customers (i.e. those who pay money to Facebook) will get a slightly more detailed release. But the whole goal is to give as little information as possible while appearing to be open. As an engineer that makes me growl, but that's how it is in this litigous world -- don't want to give someone a reason to sue.
The thing is that a long term roadmap for a startup is 3 years. So you're going to look for things that are going to get you 3 years down the road cheaply, and then you still aren't that big, you have gigabytes of data, not hundreds of terabytes of data, so pivoting to another cloud provider isn't a big deal. Now, scale up to a company that has a monthly IT spend of 50 million dollars. You aren't moving that much infrastructure between cloud providers on a dime. Past a certain scale, there is a huge incentive to standardize on a vendor that has a 10 year time scale. We know AWS will be there in 10 years. Will GCP be there in 10 years?
They're already there on my part. Between their firing employees who organize or complain that their corporate slogan apparently now is "Be Evil", their chaotic product decision making, and their toxic internal politics, I have absolutely no interest in working for Google. Furthermore, I've noticed that the Google workforce seems to be becoming less.... Googly.... recently (disclaimer: I work down the street from the Googleplex and see many Googlers as they do their daily migrations). As in, they're now hiring a broader selection of people who aren't just the top 5% in class. What that tells me is that they're having more difficulty on the recruiting front and having to cast their net wider.
The Fortune 500 made $1.1 trillion in corporate profits last year. The notion that they'll buy less stuff because shipping now costs $5 extra is ludicrous. Their problem is what to do with all that surplus cash now that they've bought down short-term Treasuries to basically 0% interest, a 1-3% increase in shipping costs wouldn't even appear on their "OMG!" radar.