Ubi-soft dev-team
In the age of virtual networking, virtual servers etc... You could roll out a change like this at night, you could even have 1:1 copy of your infrastucture and test it before you roll out changes live...
Ubi-soft management
Rolling out changes when the majority of your users are awake will actually give you a income loss that day, you could even do calculations to evaluate when the income loss is at the lowest...