My tongue-in-cheek definition of FAAN(M)G is "does the company have sufficient resources and technical wits to have entire team(s) dedicated to stress-testing and breaking their internal systems proactively to ensure uptime and low latency?" Netflix with Chaos Monkey definitely applies, and Microsoft does as well. Arguably Salesforce would be there too, if not for their meme-worthy historical failure at the low-latency part.