It's not just all of the products they've dropped in the past, it's also the cumulative day-to-day experience I've had with them overall. When their stuff works, it's great, but if anything goes wrong, one faces the impervious silent wall of Google's tech support, or rather complete lack thereof. The idea of trusting their compute cloud for a business service that truly has to be reliable seems insane.

They make great free toys that mostly work and make a lot of money doing so. I'm glad to use those toys for free, but I'm under no allusions that what often works will always work. That's not their forte.