I sincerely doubt 37 signals has "a few dozen servers." Every company I've been in has a huge, sprawling cloud and that no one has governance over. New instance

I sincerely doubt 37 signals has "a few dozen servers." Every company I've been in has a huge, sprawling cloud and that no one has governance over. New instances are stood up by individual teams in order to avoid bureaucratic delay, and these propagate indefinitely.