Yeah, Google would easily top the list of companies which can have catastrophic impact. Microsoft, Apple, Salesforce, Dropbox would be the next in the list I guess if we leave out the utility companies and internet providers etc.
Just look at the impact a 40 minute outage of Google Auth had last month, I wouldn't be surprised if the global productivity hit during that outage was in the billions of dollars, and that was for a relatively short outage without any data loss.
AWS outages have basically crippled a few businesses. The longest I know of was 8-10 hours the day before Thanksgiving. Some Bay Area food company got hit by it and couldn’t deliver thanksgiving dinners.
