More money in the company pocket. More work for the people who did the migration and now maintaining their own cloud. Then when the people who put this together leave, the rest are stuck with one of a kind cloud.

Maybe a good idea, but if it's only saving money that can only happen 1 time, then people expect the same cost going forward ...

They open sourced the entire deployment apparatus that they built to do all of this - it is simple to use. They'll have no issues maintaining it or finding new people if/when needed.

And, if you bothered reading, there's significant annual savings, into perpetuity. Because aws is a racket.

I can’t speak to 37signals specifically, but most on prem tech is pretty standardized.

There’s nothing particularly bespoke about throwing RHEL on Dell servers running in a 3rd party managed white glove data center.

They already had a team of people that handled this stuff. AWS requires a lot of maintenance on it's own sort.