No doubt -- there are plenty of downsides to running your own stuff. I'm not anti-AWS. I'm pro-efficiency, and pro making deliberate choices. If there's a choice is spend $10M extra on AWS because the engineers get a good vibe -- there should be a compelling reason why that vibe is worth $10M. (And there may well be)

Look at what Amazon/Google/Microsoft does. If you told me you advocate running your own power plants, I'd eyeroll. But... if you're as large a power consumer as a hyper-scaler, totally different story. Google and Microsoft are investing in lighting up old nuclear plants.