Hope they put a lot of it (money) in their server infrastructure and better management of incident handling on gitlab.com. Thinks can break or get slow (sure) but their competitor (github) is in comparison rock solid. I cannot even count the 503 or git downtimes on gitlab.com I hope they look on a lot of worse case scenarios like e.g. an upgrade breaks things, DB issues etc. and look how big big cloud installations are doing this stuff (staged updates, roll backs etc.)